diff --git a/PyNDN/impl/__init__.py b/PyNDN/impl/__init__.py
new file mode 100644
index 0000000..e048223
--- /dev/null
+++ b/PyNDN/impl/__init__.py
@@ -0,0 +1,18 @@
+## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
+# 
+# Copyright (c) 2011-2013, Regents of the University of California
+#                          Alexander Afanasyev
+# 
+# GNU 3.0 license, See the LICENSE file for more information
+# 
+# Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+# 
+
+#
+# Based on PyCCN code, copyrighted and licensed as follows
+#
+# Copyright (c) 2011-2013, Regents of the University of California
+# BSD license, See the COPYING file for more information
+# Written by: Derek Kulinski <takeda@takeda.tk>
+#             Jeff Burke <jburke@ucla.edu>
+#