diff --git a/ICSharpCode.Decompiler/IL/Transforms/ILExtraction.cs b/ICSharpCode.Decompiler/IL/Transforms/ILExtraction.cs
index 5a1cbf01d..84878611f 100644
--- a/ICSharpCode.Decompiler/IL/Transforms/ILExtraction.cs
+++ b/ICSharpCode.Decompiler/IL/Transforms/ILExtraction.cs
@@ -1,8 +1,25 @@
-using System;
+// Copyright (c) 2019 Daniel Grunwald
+// 
+// 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.
+
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
-using System.Threading;
 
 namespace ICSharpCode.Decompiler.IL.Transforms
 {
diff --git a/ICSharpCode.Decompiler/IL/Transforms/ProxyCallReplacer.cs b/ICSharpCode.Decompiler/IL/Transforms/ProxyCallReplacer.cs
index 13c87c56b..605de9aa1 100644
--- a/ICSharpCode.Decompiler/IL/Transforms/ProxyCallReplacer.cs
+++ b/ICSharpCode.Decompiler/IL/Transforms/ProxyCallReplacer.cs
@@ -1,5 +1,21 @@
-using System;
-using System.Diagnostics;
+// Copyright (c) 2017 AlphaSierraPapa for the SharpDevelop Team
+// 
+// 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.
+
 using System.Linq;
 using System.Reflection.Metadata;
 using ICSharpCode.Decompiler.TypeSystem;