diff --git a/QuickLook.Native/QuickLook.Native32/DialogHook.cpp b/QuickLook.Native/QuickLook.Native32/DialogHook.cpp
index 6e875dc..c1584ab 100644
--- a/QuickLook.Native/QuickLook.Native32/DialogHook.cpp
+++ b/QuickLook.Native/QuickLook.Native32/DialogHook.cpp
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 #include "DialogHook.h"
 #include "WoW64HookHelper.h"
diff --git a/QuickLook.Native/QuickLook.Native32/DialogHook.h b/QuickLook.Native/QuickLook.Native32/DialogHook.h
index 898dfe0..4ccec01 100644
--- a/QuickLook.Native/QuickLook.Native32/DialogHook.h
+++ b/QuickLook.Native/QuickLook.Native32/DialogHook.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 class DialogHook
 {
diff --git a/QuickLook.Native/QuickLook.Native32/DllExport.cpp b/QuickLook.Native/QuickLook.Native32/DllExport.cpp
index a2e9216..c26c159 100644
--- a/QuickLook.Native/QuickLook.Native32/DllExport.cpp
+++ b/QuickLook.Native/QuickLook.Native32/DllExport.cpp
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 
 #include "Shell32.h"
diff --git a/QuickLook.Native/QuickLook.Native32/HelperMethods.cpp b/QuickLook.Native/QuickLook.Native32/HelperMethods.cpp
index 9ef1ada..0739b24 100644
--- a/QuickLook.Native/QuickLook.Native32/HelperMethods.cpp
+++ b/QuickLook.Native/QuickLook.Native32/HelperMethods.cpp
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 #include "HelperMethods.h"
 
diff --git a/QuickLook.Native/QuickLook.Native32/HelperMethods.h b/QuickLook.Native/QuickLook.Native32/HelperMethods.h
index 3552afd..e558877 100644
--- a/QuickLook.Native/QuickLook.Native32/HelperMethods.h
+++ b/QuickLook.Native/QuickLook.Native32/HelperMethods.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 class HelperMethods
 {
diff --git a/QuickLook.Native/QuickLook.Native32/Shell32.cpp b/QuickLook.Native/QuickLook.Native32/Shell32.cpp
index c09f3a4..a2dd44e 100644
--- a/QuickLook.Native/QuickLook.Native32/Shell32.cpp
+++ b/QuickLook.Native/QuickLook.Native32/Shell32.cpp
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 
 #include "Shell32.h"
diff --git a/QuickLook.Native/QuickLook.Native32/Shell32.h b/QuickLook.Native/QuickLook.Native32/Shell32.h
index 496498f..5d016ff 100644
--- a/QuickLook.Native/QuickLook.Native32/Shell32.h
+++ b/QuickLook.Native/QuickLook.Native32/Shell32.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 #include "stdafx.h"
diff --git a/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.cpp b/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.cpp
index b630888..1d24e26 100644
--- a/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.cpp
+++ b/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.cpp
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 #include "WoW64HookHelper.h"
 
diff --git a/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.h b/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.h
index 5a41ceb..99da55b 100644
--- a/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.h
+++ b/QuickLook.Native/QuickLook.Native32/WoW64HookHelper.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 #include "stdafx.h"
diff --git a/QuickLook.Native/QuickLook.Native32/dllmain.cpp b/QuickLook.Native/QuickLook.Native32/dllmain.cpp
index f8373b0..7ed8459 100644
--- a/QuickLook.Native/QuickLook.Native32/dllmain.cpp
+++ b/QuickLook.Native/QuickLook.Native32/dllmain.cpp
@@ -1,4 +1,20 @@
-// dllmain.cpp : Defines the entry point for the DLL application.
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "stdafx.h"
 #include "Shell32.h"
 
diff --git a/QuickLook.Native/QuickLook.Native32/stdafx.cpp b/QuickLook.Native/QuickLook.Native32/stdafx.cpp
index 2c536e2..8492b6e 100644
--- a/QuickLook.Native/QuickLook.Native32/stdafx.cpp
+++ b/QuickLook.Native/QuickLook.Native32/stdafx.cpp
@@ -1,6 +1,19 @@
-// stdafx.cpp : source file that includes just the standard includes
-// QuickLook.Shell32Helper.pch will be the pre-compiled header
-// stdafx.obj will contain the pre-compiled type information
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "stdafx.h"
 
diff --git a/QuickLook.Native/QuickLook.Native32/stdafx.h b/QuickLook.Native/QuickLook.Native32/stdafx.h
index a1380bf..de4a3d4 100644
--- a/QuickLook.Native/QuickLook.Native32/stdafx.h
+++ b/QuickLook.Native/QuickLook.Native32/stdafx.h
@@ -1,7 +1,19 @@
-// stdafx.h : include file for standard system include files,
-// or project specific include files that are used frequently, but
-// are changed infrequently
-//
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
diff --git a/QuickLook.Native/QuickLook.Native32/targetver.h b/QuickLook.Native/QuickLook.Native32/targetver.h
index 87c0086..c83111b 100644
--- a/QuickLook.Native/QuickLook.Native32/targetver.h
+++ b/QuickLook.Native/QuickLook.Native32/targetver.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 // Including SDKDDKVer.h defines the highest available Windows platform.
diff --git a/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.cpp b/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.cpp
index 588868f..53a2cc9 100644
--- a/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.cpp
+++ b/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.cpp
@@ -1,5 +1,19 @@
-// QuickLook.WoW64HookHelper.cpp : Defines the entry point for the application.
-//
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "stdafx.h"
 
diff --git a/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.h b/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.h
index 71ea333..f7f61a9 100644
--- a/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.h
+++ b/QuickLook.Native/QuickLook.WoW64HookHelper/QuickLook.WoW64HookHelper.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 #include "stdafx.h"
diff --git a/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.cpp b/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.cpp
index 2082734..8492b6e 100644
--- a/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.cpp
+++ b/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.cpp
@@ -1,6 +1,19 @@
-// stdafx.cpp : source file that includes just the standard includes
-// QuickLook.Native.WoW64HookHelper.pch will be the pre-compiled header
-// stdafx.obj will contain the pre-compiled type information
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "stdafx.h"
 
diff --git a/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.h b/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.h
index bb80440..1472c42 100644
--- a/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.h
+++ b/QuickLook.Native/QuickLook.WoW64HookHelper/stdafx.h
@@ -1,7 +1,19 @@
-// stdafx.h : include file for standard system include files,
-// or project specific include files that are used frequently, but
-// are changed infrequently
-//
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
diff --git a/QuickLook.Native/QuickLook.WoW64HookHelper/targetver.h b/QuickLook.Native/QuickLook.WoW64HookHelper/targetver.h
index 87c0086..c83111b 100644
--- a/QuickLook.Native/QuickLook.WoW64HookHelper/targetver.h
+++ b/QuickLook.Native/QuickLook.WoW64HookHelper/targetver.h
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 // Including SDKDDKVer.h defines the highest available Windows platform.
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileEntry.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileEntry.cs
index 92c1f8f..5bcbf05 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileEntry.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileEntry.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileListView.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileListView.xaml.cs
index a0fc145..8f4afea 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileListView.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileListView.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Windows.Controls;
 
 namespace QuickLook.Plugin.ArchiveViewer
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveInfoPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveInfoPanel.xaml.cs
index b5e7022..12cf528 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveInfoPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveInfoPanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Converters.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Converters.cs
index 9312197..af5a8ff 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Converters.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Converters.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Extensions.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Extensions.cs
index 05de561..f15d25f 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Extensions.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Extensions.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.Windows;
 using System.Windows.Media;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/IconManager.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/IconManager.cs
index a0d71ab..0f7f734 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/IconManager.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/IconManager.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Plugin.cs
index c3e3ad6..3e97107 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Plugin.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.IO;
 using System.Windows;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Properties/AssemblyInfo.cs
index 7c2c7a7..bef0bde 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
index bd201f5..fb5416a 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System.IO;
 using System.Text;
 using Microsoft.Win32;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Plugin.cs
index d8f50b7..6924edd 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Plugin.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Windows;
 using System.Windows.Threading;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Properties/AssemblyInfo.cs
index 71ecd0c..5c252ab 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Windows;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebpagePanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebpagePanel.xaml.cs
index 0ba4b1e..dea1aac 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebpagePanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebpagePanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Text;
 using System.Windows.Controls;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WpfBrowserWrapper.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WpfBrowserWrapper.cs
index aa90be6..5488852 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WpfBrowserWrapper.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WpfBrowserWrapper.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.IO;
 using System.Reflection;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IInitializeWithFile.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IInitializeWithFile.cs
index 7c4caed..87133a6 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IInitializeWithFile.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IInitializeWithFile.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System.Runtime.InteropServices;
 
 namespace QuickLook.Plugin.IPreviewHandlers
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IPreviewHandler.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IPreviewHandler.cs
index ffdf3a1..ac503d7 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IPreviewHandler.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/IPreviewHandler.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Drawing;
 using System.Runtime.InteropServices;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PluginInterface.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PluginInterface.cs
index 0231653..6e8b07c 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PluginInterface.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PluginInterface.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Windows;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
index 09d9f4c..a1278b6 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewHandlerHost.cs
@@ -1,5 +1,19 @@
-// Preview Handlers Revisted
-// Bradley Smith - 2010/09/17, updated 2013/10/14
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 using System;
 using System.ComponentModel;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
index 640d101..d3c5601 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/PreviewPanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Runtime.InteropServices;
 using System.Windows.Controls;
 using System.Windows.Threading;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/Properties/AssemblyInfo.cs
index e862382..9f1efb0 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.IPreviewHandlers/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Windows;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs
index 9f8933b..7c3d0d2 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Windows;
 using ExifLib;
 using ImageMagick;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
index aafbca2..e1742d6 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs
index 3312745..e327963 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs
@@ -1,4 +1,21 @@
-using System.IO;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Windows;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Properties/AssemblyInfo.cs
index 5e45b28..67cf9cc 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following
diff --git a/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Plugin.cs
index 925bfa8..81bde9f 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Plugin.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Windows;
 using System.Windows.Threading;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Properties/AssemblyInfo.cs
index 5e45b28..67cf9cc 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.MarkdownViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/DpiHelpers.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/DpiHelpers.cs
index 9da7383..0e41788 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/DpiHelpers.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/DpiHelpers.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Drawing;
 using System.Runtime.InteropServices;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Extensions.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Extensions.cs
index 00858bb..406d972 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Extensions.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Extensions.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Drawing.Imaging;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
index cffa7d7..6868a57 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/LibMuPdf.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.Runtime.InteropServices;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/MouseWheelMonitor.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/MouseWheelMonitor.cs
index f5be1f4..a0a3e48 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/MouseWheelMonitor.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/MouseWheelMonitor.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Linq;
 using System.Threading;
 using System.Windows;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PageIdToImageConverter.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PageIdToImageConverter.cs
index e2662cf..c10db66 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PageIdToImageConverter.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PageIdToImageConverter.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows.Data;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfFile.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfFile.cs
index 21d48f6..910e22b 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfFile.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfFile.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Drawing;
 using Size = System.Windows.Size;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs
index 34e51c2..ae8a6e6 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Linq;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs
index b2a64d3..4f93602 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Runtime.ExceptionServices;
 using System.Windows.Threading;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Properties/AssemblyInfo.cs
index 0e301f0..0c290a1 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following
diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs
index b021a61..bb99587 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs
@@ -1,4 +1,21 @@
-using System.IO;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.IO;
 using System.Windows;
 using ICSharpCode.AvalonEdit.Highlighting;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Properties/AssemblyInfo.cs
index fae95c8..6973e0f 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following
diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.xaml.cs
index 1adc045..3365a6d 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.xaml.cs
@@ -1,4 +1,21 @@
-using System.IO;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.IO;
 using System.Windows.Controls;
 using ICSharpCode.AvalonEdit.Highlighting;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/DoubleToHMSConverter.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/DoubleToHMSConverter.cs
index fd51091..e04bb61 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/DoubleToHMSConverter.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/DoubleToHMSConverter.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/PluginInterface.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/PluginInterface.cs
index 103b5b0..7b95d30 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/PluginInterface.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/PluginInterface.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Linq;
 using System.Windows;
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Properties/AssemblyInfo.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Properties/AssemblyInfo.cs
index 7c8bc97..af31c1a 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Properties/AssemblyInfo.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Windows;
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
index fbe005a..633fa36 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Windows;
diff --git a/QuickLook.sln.DotSettings b/QuickLook.sln.DotSettings
index 258c160..b66cfe4 100644
--- a/QuickLook.sln.DotSettings
+++ b/QuickLook.sln.DotSettings
@@ -17,6 +17,24 @@
 	<s:Int64 x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/BLANK_LINES_AROUND_AUTO_PROPERTY/@EntryValue">0</s:Int64>
 	<s:Int64 x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/BLANK_LINES_AROUND_FIELD/@EntryValue">0</s:Int64>
 	<s:Int64 x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/BLANK_LINES_AROUND_PROPERTY/@EntryValue">0</s:Int64>
+	<s:String x:Key="/Default/CodeStyle/FileHeader/FileHeaderRegionName/@EntryValue"></s:String>
+	<s:String x:Key="/Default/CodeStyle/FileHeader/FileHeaderText/@EntryValue">Copyright © $CURRENT_YEAR$ $USER_NAME$&#xD;
+&#xD;
+This file is part of $SOLUTION$ program.&#xD;
+&#xD;
+This program is free software: you can redistribute it and/or modify&#xD;
+it under the terms of the GNU General Public License as published by&#xD;
+the Free Software Foundation, either version 3 of the License, or&#xD;
+(at your option) any later version.&#xD;
+&#xD;
+This program is distributed in the hope that it will be useful,&#xD;
+but WITHOUT ANY WARRANTY; without even the implied warranty of&#xD;
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the&#xD;
+GNU General Public License for more details.&#xD;
+&#xD;
+You should have received a copy of the GNU General Public License&#xD;
+along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.&#xD;
+</s:String>
 	<s:Boolean x:Key="/Default/Environment/ExternalSources/FirstTimeFormShown/@EntryValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/ExternalSources/Decompiler/DecompileMethodBodies/@EntryValue">False</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/Feedback/ShouldPrompt/@EntryValue">False</s:Boolean>
diff --git a/QuickLook/App.xaml.cs b/QuickLook/App.xaml.cs
index f8aad95..1da86c8 100644
--- a/QuickLook/App.xaml.cs
+++ b/QuickLook/App.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.IO;
 using System.Linq;
 using System.Reflection;
diff --git a/QuickLook/BackgroundListener.cs b/QuickLook/BackgroundListener.cs
index 3085d8d..18f2808 100644
--- a/QuickLook/BackgroundListener.cs
+++ b/QuickLook/BackgroundListener.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Windows.Forms;
 using System.Windows.Threading;
 using QuickLook.Helpers;
diff --git a/QuickLook/Controls/BackgroundVisualHost.cs b/QuickLook/Controls/BackgroundVisualHost.cs
index 6f73426..f077acf 100644
--- a/QuickLook/Controls/BackgroundVisualHost.cs
+++ b/QuickLook/Controls/BackgroundVisualHost.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections;
 using System.Threading;
 using System.Windows;
diff --git a/QuickLook/Controls/BusyDecorator.cs b/QuickLook/Controls/BusyDecorator.cs
index ede9894..675ec97 100644
--- a/QuickLook/Controls/BusyDecorator.cs
+++ b/QuickLook/Controls/BusyDecorator.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections;
 using System.Windows;
 using System.Windows.Controls;
diff --git a/QuickLook/Controls/VisualTargetPresentationSource.cs b/QuickLook/Controls/VisualTargetPresentationSource.cs
index 141984a..82b67d2 100644
--- a/QuickLook/Controls/VisualTargetPresentationSource.cs
+++ b/QuickLook/Controls/VisualTargetPresentationSource.cs
@@ -1,4 +1,21 @@
-using System.Windows;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Windows;
 using System.Windows.Media;
 
 namespace QuickLook.Controls
diff --git a/QuickLook/Converters/BooleanToResizeBorderThicknessConverter.cs b/QuickLook/Converters/BooleanToResizeBorderThicknessConverter.cs
index cf5adf3..bc8a2f0 100644
--- a/QuickLook/Converters/BooleanToResizeBorderThicknessConverter.cs
+++ b/QuickLook/Converters/BooleanToResizeBorderThicknessConverter.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
diff --git a/QuickLook/Converters/BooleanToResizeModeConverter.cs b/QuickLook/Converters/BooleanToResizeModeConverter.cs
index 09431e6..d8ba14b 100644
--- a/QuickLook/Converters/BooleanToResizeModeConverter.cs
+++ b/QuickLook/Converters/BooleanToResizeModeConverter.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
diff --git a/QuickLook/Converters/BooleanToVisibilityCollapsedConverter.cs b/QuickLook/Converters/BooleanToVisibilityCollapsedConverter.cs
index bc26cab..3bdf71f 100644
--- a/QuickLook/Converters/BooleanToVisibilityCollapsedConverter.cs
+++ b/QuickLook/Converters/BooleanToVisibilityCollapsedConverter.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.Windows;
 using System.Windows.Data;
diff --git a/QuickLook/ExtensionMethods/DispatcherExtensions.cs b/QuickLook/ExtensionMethods/DispatcherExtensions.cs
index 6c5245d..242136f 100644
--- a/QuickLook/ExtensionMethods/DispatcherExtensions.cs
+++ b/QuickLook/ExtensionMethods/DispatcherExtensions.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Threading.Tasks;
 using System.Windows.Threading;
 
diff --git a/QuickLook/ExtensionMethods/TypeExtensions.cs b/QuickLook/ExtensionMethods/TypeExtensions.cs
index 607578e..3942d5d 100644
--- a/QuickLook/ExtensionMethods/TypeExtensions.cs
+++ b/QuickLook/ExtensionMethods/TypeExtensions.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 
 namespace QuickLook.ExtensionMethods
 {
diff --git a/QuickLook/FocusMonitor.cs b/QuickLook/FocusMonitor.cs
index b539992..b90b2e1 100644
--- a/QuickLook/FocusMonitor.cs
+++ b/QuickLook/FocusMonitor.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 
diff --git a/QuickLook/GlobalKeyboardHook.cs b/QuickLook/GlobalKeyboardHook.cs
index eac0c2f..f719b9e 100644
--- a/QuickLook/GlobalKeyboardHook.cs
+++ b/QuickLook/GlobalKeyboardHook.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Collections.Generic;
 using System.Windows.Forms;
diff --git a/QuickLook/Helpers/AutoStartupHelper.cs b/QuickLook/Helpers/AutoStartupHelper.cs
index d74e301..d7afe6c 100644
--- a/QuickLook/Helpers/AutoStartupHelper.cs
+++ b/QuickLook/Helpers/AutoStartupHelper.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.IO;
 using Shell32;
diff --git a/QuickLook/Helpers/BlurLibrary/BlurWindow.cs b/QuickLook/Helpers/BlurLibrary/BlurWindow.cs
index 3e996de..87dff32 100644
--- a/QuickLook/Helpers/BlurLibrary/BlurWindow.cs
+++ b/QuickLook/Helpers/BlurLibrary/BlurWindow.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Windows;
 using System.Windows.Interop;
 
diff --git a/QuickLook/Helpers/BlurLibrary/Helpers.cs b/QuickLook/Helpers/BlurLibrary/Helpers.cs
index e8f6583..89b6c33 100644
--- a/QuickLook/Helpers/BlurLibrary/Helpers.cs
+++ b/QuickLook/Helpers/BlurLibrary/Helpers.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Windows;
 using System.Windows.Interop;
 using QuickLook.Helpers.BlurLibrary.PlatformsImpl;
diff --git a/QuickLook/Helpers/BlurLibrary/IWindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/IWindowBlurController.cs
index 7efb6f5..46eb43b 100644
--- a/QuickLook/Helpers/BlurLibrary/IWindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/IWindowBlurController.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 
 namespace QuickLook.Helpers.BlurLibrary
 {
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/NativeMethods.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/NativeMethods.cs
index 05db8b5..43266fc 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/NativeMethods.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/NativeMethods.cs
@@ -1,4 +1,21 @@
-using System.Security;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Security;
 
 namespace QuickLook.Helpers.BlurLibrary.NativeThings
 {
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentPolicy.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentPolicy.cs
index 85da1cb..6ac5569 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentPolicy.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentPolicy.cs
@@ -1,4 +1,21 @@
-using System.Runtime.InteropServices;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Runtime.InteropServices;
 
 namespace QuickLook.Helpers.BlurLibrary.NativeThings.Windows10
 {
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentState.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentState.cs
index 23e111c..2644d25 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentState.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/AccentState.cs
@@ -1,4 +1,19 @@
-// ReSharper disable InconsistentNaming
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 namespace QuickLook.Helpers.BlurLibrary.NativeThings.Windows10
 {
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/NativeMethods.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/NativeMethods.cs
index 102ee22..407c27e 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/NativeMethods.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/NativeMethods.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Runtime.InteropServices;
 
 // ReSharper disable once CheckNamespace
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttribute.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttribute.cs
index 2af0729..eaa0d5e 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttribute.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttribute.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 namespace QuickLook.Helpers.BlurLibrary.NativeThings.Windows10
 {
     internal enum WindowCompositionAttribute
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttributeData.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttributeData.cs
index 00756e3..35acc96 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttributeData.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/Windows10/WindowCompositionAttributeData.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Runtime.InteropServices;
 
diff --git a/QuickLook/Helpers/BlurLibrary/NativeThings/WindowsVistaAnd7/NativeMethods.cs b/QuickLook/Helpers/BlurLibrary/NativeThings/WindowsVistaAnd7/NativeMethods.cs
index 0effcb9..2cf51f0 100644
--- a/QuickLook/Helpers/BlurLibrary/NativeThings/WindowsVistaAnd7/NativeMethods.cs
+++ b/QuickLook/Helpers/BlurLibrary/NativeThings/WindowsVistaAnd7/NativeMethods.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Runtime.InteropServices;
 
 // ReSharper disable FieldCanBeMadeReadOnly.Global
diff --git a/QuickLook/Helpers/BlurLibrary/OsHelper.cs b/QuickLook/Helpers/BlurLibrary/OsHelper.cs
index de1359e..417af13 100644
--- a/QuickLook/Helpers/BlurLibrary/OsHelper.cs
+++ b/QuickLook/Helpers/BlurLibrary/OsHelper.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 
 namespace QuickLook.Helpers.BlurLibrary
diff --git a/QuickLook/Helpers/BlurLibrary/OsType.cs b/QuickLook/Helpers/BlurLibrary/OsType.cs
index 5e59940..b2785d8 100644
--- a/QuickLook/Helpers/BlurLibrary/OsType.cs
+++ b/QuickLook/Helpers/BlurLibrary/OsType.cs
@@ -1,4 +1,21 @@
-namespace QuickLook.Helpers.BlurLibrary
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace QuickLook.Helpers.BlurLibrary
 {
     internal enum OsType
     {
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/OsNotSupportedWindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/OsNotSupportedWindowBlurController.cs
index 8fe8c97..c63acb9 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/OsNotSupportedWindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/OsNotSupportedWindowBlurController.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 
 namespace QuickLook.Helpers.BlurLibrary.PlatformsImpl
 {
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows10WindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows10WindowBlurController.cs
index 16067f5..ebe84ba 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows10WindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows10WindowBlurController.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Runtime.InteropServices;
 using QuickLook.Helpers.BlurLibrary.NativeThings.Windows10;
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows7WindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows7WindowBlurController.cs
index 397a374..05fd933 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows7WindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows7WindowBlurController.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 namespace QuickLook.Helpers.BlurLibrary.PlatformsImpl
 {
     internal class Windows7WindowBlurController : WindowsVistaWindowBlurController
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows81WindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows81WindowBlurController.cs
index fc4be03..405cee8 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows81WindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows81WindowBlurController.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 namespace QuickLook.Helpers.BlurLibrary.PlatformsImpl
 {
     internal class Windows81WindowBlurController : Windows8WindowBlurController
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows8WindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows8WindowBlurController.cs
index f24d4ac..33ebbb7 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows8WindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/Windows8WindowBlurController.cs
@@ -1,4 +1,21 @@
-namespace QuickLook.Helpers.BlurLibrary.PlatformsImpl
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace QuickLook.Helpers.BlurLibrary.PlatformsImpl
 {
     internal class Windows8WindowBlurController : OsNotSupportedWindowBlurController
     {
diff --git a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/WindowsVistaWindowBlurController.cs b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/WindowsVistaWindowBlurController.cs
index 891ccd1..a79c5cf 100644
--- a/QuickLook/Helpers/BlurLibrary/PlatformsImpl/WindowsVistaWindowBlurController.cs
+++ b/QuickLook/Helpers/BlurLibrary/PlatformsImpl/WindowsVistaWindowBlurController.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Windows.Interop;
 
diff --git a/QuickLook/Helpers/DpiHelper.cs b/QuickLook/Helpers/DpiHelper.cs
index c8194fc..b7a8ade 100644
--- a/QuickLook/Helpers/DpiHelper.cs
+++ b/QuickLook/Helpers/DpiHelper.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Drawing;
 using System.Runtime.InteropServices;
diff --git a/QuickLook/Helpers/FileHelper.cs b/QuickLook/Helpers/FileHelper.cs
index 8afcb97..b8a080c 100644
--- a/QuickLook/Helpers/FileHelper.cs
+++ b/QuickLook/Helpers/FileHelper.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
diff --git a/QuickLook/Helpers/ProcessHelper.cs b/QuickLook/Helpers/ProcessHelper.cs
index 471e283..4006529 100644
--- a/QuickLook/Helpers/ProcessHelper.cs
+++ b/QuickLook/Helpers/ProcessHelper.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Threading.Tasks;
 
 namespace QuickLook.Helpers
diff --git a/QuickLook/Helpers/WindowHelper.cs b/QuickLook/Helpers/WindowHelper.cs
index 96209eb..7c862e2 100644
--- a/QuickLook/Helpers/WindowHelper.cs
+++ b/QuickLook/Helpers/WindowHelper.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.Windows;
 using System.Windows.Forms;
diff --git a/QuickLook/MainWindowNoTransparent.cs b/QuickLook/MainWindowNoTransparent.cs
index a213792..ad8c2e4 100644
--- a/QuickLook/MainWindowNoTransparent.cs
+++ b/QuickLook/MainWindowNoTransparent.cs
@@ -1,4 +1,21 @@
-using System.Windows.Media;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Windows.Media;
 
 namespace QuickLook
 {
diff --git a/QuickLook/MainWindowTransparent.xaml.cs b/QuickLook/MainWindowTransparent.xaml.cs
index c0bafdf..f17bc21 100644
--- a/QuickLook/MainWindowTransparent.xaml.cs
+++ b/QuickLook/MainWindowTransparent.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.ExceptionServices;
diff --git a/QuickLook/NativeMethods/Kernel32.cs b/QuickLook/NativeMethods/Kernel32.cs
index 5793603..9a2d721 100644
--- a/QuickLook/NativeMethods/Kernel32.cs
+++ b/QuickLook/NativeMethods/Kernel32.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace QuickLook.NativeMethods
diff --git a/QuickLook/NativeMethods/QuickLook.cs b/QuickLook/NativeMethods/QuickLook.cs
index 8b5cf5b..cefc05e 100644
--- a/QuickLook/NativeMethods/QuickLook.cs
+++ b/QuickLook/NativeMethods/QuickLook.cs
@@ -1,7 +1,23 @@
-using System.Runtime.InteropServices;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading.Tasks;
-using System.Windows;
 
 namespace QuickLook.NativeMethods
 {
diff --git a/QuickLook/NativeMethods/User32.cs b/QuickLook/NativeMethods/User32.cs
index 3ce88ba..ab34606 100644
--- a/QuickLook/NativeMethods/User32.cs
+++ b/QuickLook/NativeMethods/User32.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 using System.Text;
diff --git a/QuickLook/PipeServerManager.cs b/QuickLook/PipeServerManager.cs
index 1c255d6..245e620 100644
--- a/QuickLook/PipeServerManager.cs
+++ b/QuickLook/PipeServerManager.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.IO;
 using System.IO.Pipes;
diff --git a/QuickLook/Plugin/ContextObject.cs b/QuickLook/Plugin/ContextObject.cs
index c60f2c5..a840586 100644
--- a/QuickLook/Plugin/ContextObject.cs
+++ b/QuickLook/Plugin/ContextObject.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
 using System.Windows;
diff --git a/QuickLook/Plugin/IViewer.cs b/QuickLook/Plugin/IViewer.cs
index d625698..62b6a44 100644
--- a/QuickLook/Plugin/IViewer.cs
+++ b/QuickLook/Plugin/IViewer.cs
@@ -1,4 +1,21 @@
-namespace QuickLook.Plugin
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace QuickLook.Plugin
 {
     /// <summary>
     ///     Interface implemented by every QuickLook.Plugin
diff --git a/QuickLook/Plugin/InfoPanel/DpiHelpers.cs b/QuickLook/Plugin/InfoPanel/DpiHelpers.cs
index c82256c..404ae86 100644
--- a/QuickLook/Plugin/InfoPanel/DpiHelpers.cs
+++ b/QuickLook/Plugin/InfoPanel/DpiHelpers.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Drawing;
 using System.Runtime.InteropServices;
diff --git a/QuickLook/Plugin/InfoPanel/Extensions.cs b/QuickLook/Plugin/InfoPanel/Extensions.cs
index eb9f64d..f0d71bc 100644
--- a/QuickLook/Plugin/InfoPanel/Extensions.cs
+++ b/QuickLook/Plugin/InfoPanel/Extensions.cs
@@ -1,4 +1,21 @@
-using System.Drawing;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Drawing;
 using System.Drawing.Imaging;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
diff --git a/QuickLook/Plugin/InfoPanel/FileHelper.cs b/QuickLook/Plugin/InfoPanel/FileHelper.cs
index c3324f8..f554839 100644
--- a/QuickLook/Plugin/InfoPanel/FileHelper.cs
+++ b/QuickLook/Plugin/InfoPanel/FileHelper.cs
@@ -1,3 +1,20 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/QuickLook/Plugin/InfoPanel/InfoPanel.xaml.cs b/QuickLook/Plugin/InfoPanel/InfoPanel.xaml.cs
index d60d5d4..3821dae 100644
--- a/QuickLook/Plugin/InfoPanel/InfoPanel.xaml.cs
+++ b/QuickLook/Plugin/InfoPanel/InfoPanel.xaml.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Globalization;
 using System.IO;
 using System.Threading.Tasks;
diff --git a/QuickLook/Plugin/InfoPanel/PluginInterface.cs b/QuickLook/Plugin/InfoPanel/PluginInterface.cs
index 1905689..ab24f77 100644
--- a/QuickLook/Plugin/InfoPanel/PluginInterface.cs
+++ b/QuickLook/Plugin/InfoPanel/PluginInterface.cs
@@ -1,4 +1,21 @@
-using System.Windows;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Windows;
 
 namespace QuickLook.Plugin.InfoPanel
 {
diff --git a/QuickLook/Plugin/InfoPanel/WindowsThumbnailProvider.cs b/QuickLook/Plugin/InfoPanel/WindowsThumbnailProvider.cs
index 817e690..91b4f2f 100644
--- a/QuickLook/Plugin/InfoPanel/WindowsThumbnailProvider.cs
+++ b/QuickLook/Plugin/InfoPanel/WindowsThumbnailProvider.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.IO;
diff --git a/QuickLook/PluginManager.cs b/QuickLook/PluginManager.cs
index 07d8fef..29c1255 100644
--- a/QuickLook/PluginManager.cs
+++ b/QuickLook/PluginManager.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
diff --git a/QuickLook/Properties/Annotations.cs b/QuickLook/Properties/Annotations.cs
index c1a6d8c..5848e3b 100644
--- a/QuickLook/Properties/Annotations.cs
+++ b/QuickLook/Properties/Annotations.cs
@@ -1,24 +1,19 @@
-/* MIT License
-
-Copyright (c) 2016 JetBrains http://www.jetbrains.com
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE. */
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 using System;
 
diff --git a/QuickLook/Properties/AssemblyInfo.cs b/QuickLook/Properties/AssemblyInfo.cs
index c6b1d91..8b5be01 100644
--- a/QuickLook/Properties/AssemblyInfo.cs
+++ b/QuickLook/Properties/AssemblyInfo.cs
@@ -1,4 +1,21 @@
-using System.Reflection;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Windows;
 
diff --git a/QuickLook/TrayIconManager.cs b/QuickLook/TrayIconManager.cs
index b8f181f..dfd4c4c 100644
--- a/QuickLook/TrayIconManager.cs
+++ b/QuickLook/TrayIconManager.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.Windows.Forms;
 using QuickLook.Helpers;
diff --git a/QuickLook/ViewWindowManager.cs b/QuickLook/ViewWindowManager.cs
index 328f2ca..60aefae 100644
--- a/QuickLook/ViewWindowManager.cs
+++ b/QuickLook/ViewWindowManager.cs
@@ -1,4 +1,21 @@
-using System;
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.ExceptionServices;