Update copyright lines.
diff --git a/samples/plus/plus.py b/samples/plus/plus.py
index b9dde0c..ce3e712 100755
--- a/samples/plus/plus.py
+++ b/samples/plus/plus.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2013 Google Inc.
+# Copyright 2014 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.