diff --git a/src/sync-intro-certificate.h b/src/sync-intro-certificate.h
index 737c921..d6783ce 100644
--- a/src/sync-intro-certificate.h
+++ b/src/sync-intro-certificate.h
@@ -1,11 +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, Regents of the University of California
- *                     Yingdi Yu
+ * Copyright (c) 2012-2014 University of California, Los Angeles
  *
- * BSD license, See the LICENSE file for more information
+ * This file is part of ChronoSync, synchronization library for distributed realtime
+ * applications for NDN.
  *
- * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ * ChronoSync is free software: you can redistribute it and/or modify it 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.
+ *
+ * ChronoSync 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ChronoSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/web/index.html>
  */
 
 #ifndef SYNC_INTRO_CERTIFICATE_H