diff --git a/OpenRA.Game/Primitives/PlayerDictionary.cs b/OpenRA.Game/Primitives/PlayerDictionary.cs
index 7e9e82639d..c35402f442 100644
--- a/OpenRA.Game/Primitives/PlayerDictionary.cs
+++ b/OpenRA.Game/Primitives/PlayerDictionary.cs
@@ -1,4 +1,15 @@
-using System;
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you 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. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
 using System.Collections.Generic;
 
 namespace OpenRA.Primitives
diff --git a/OpenRA.Game/Support/ExceptionHandler.cs b/OpenRA.Game/Support/ExceptionHandler.cs
index 9625a0fa52..bf8dbb9252 100644
--- a/OpenRA.Game/Support/ExceptionHandler.cs
+++ b/OpenRA.Game/Support/ExceptionHandler.cs
@@ -1,4 +1,15 @@
-using System;
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you 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. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
 using System.Diagnostics;
 using System.Globalization;
 using System.Text;
diff --git a/OpenRA.Mods.Common/ActorInitializer.cs b/OpenRA.Mods.Common/ActorInitializer.cs
index 6b696a3957..d8d3ce53d8 100644
--- a/OpenRA.Mods.Common/ActorInitializer.cs
+++ b/OpenRA.Mods.Common/ActorInitializer.cs
@@ -1,4 +1,15 @@
-using System;
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you 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. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common