diff --git a/reactos/include/ddk/ntddsnd.h b/reactos/include/ddk/ntddsnd.h
index d4c8887a1fb..0de798e37b2 100644
--- a/reactos/include/ddk/ntddsnd.h
+++ b/reactos/include/ddk/ntddsnd.h
@@ -2,6 +2,8 @@
     ReactOS Sound System
     NT4 Multimedia Audio Support (ntddsnd.h)
 
+    This file is in the public domain.
+
     Author:
         Andrew Greenwood (andrew.greenwood@silverblade.co.uk)
 
diff --git a/reactos/include/ddk/portcls.h b/reactos/include/ddk/portcls.h
index 9481dcf4532..716d17a9e3a 100644
--- a/reactos/include/ddk/portcls.h
+++ b/reactos/include/ddk/portcls.h
@@ -2,6 +2,8 @@
     ReactOS Kernel Streaming
     Port Class
 
+    This file is in the public domain.
+
     Andrew Greenwood
 
     NOTES:
diff --git a/reactos/include/ddk/punknown.h b/reactos/include/ddk/punknown.h
index 1a44e98fda3..8bea925f0db 100644
--- a/reactos/include/ddk/punknown.h
+++ b/reactos/include/ddk/punknown.h
@@ -2,7 +2,7 @@
     ReactOS Kernel-Mode COM
     by Andrew Greenwood
 
-    Please see COPYING in the top-level directory for license information.
+    This file is in the public domain.
 */
 
 #ifndef _UNKNOWN_H_
diff --git a/reactos/include/ddk/stdunk.h b/reactos/include/ddk/stdunk.h
index b01ebb4f522..f011b045946 100644
--- a/reactos/include/ddk/stdunk.h
+++ b/reactos/include/ddk/stdunk.h
@@ -2,8 +2,7 @@
     ReactOS Kernel-Mode COM
     IUnknown implementations
 
-    LICENSE
-        Please see COPYING in the top-level directory for license information.
+    This file is in the public domain.
 
     AUTHORS
         Andrew Greenwood