diff --git a/tools/ndnsec-key-gen.hpp b/tools/ndnsec-key-gen.hpp
index 627af4b..cbd500a 100644
--- a/tools/ndnsec-key-gen.hpp
+++ b/tools/ndnsec-key-gen.hpp
@@ -1,13 +1,22 @@
-/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2014,  Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 2013-2014 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
- * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  *
- * This file licensed under New BSD License.  See COPYING for detailed information about
- * ndn-cxx library copyright, permissions, and redistribution restrictions.
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  *
  * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
  */