diff --git a/test/opaque.py b/test/opaque.py
index 35aadd53..55afa11f 100644
--- a/test/opaque.py
+++ b/test/opaque.py
@@ -1,3 +1,8 @@
+# Copyright Gottfried Ganßauge 2003. Permission to copy, use,
+# modify, sell and distribute this software is granted provided this
+# copyright notice appears in all copies. This software is provided
+# "as is" without express or implied warranty, and with no claim as
+# to its suitability for any purpose.
 """
 >>> from opaque_ext import *
 >>> #