fix check_copyright.py

tools/distrib/check_copyright.py

@@ -1,33 +1,18 @@
 #!/usr/bin/env python2.7
 
-# Copyright 2015, Google Inc.
+# Copyright 2015 gRPC authors.
-# All rights reserved.
 #
-# Redistribution and use in source and binary forms, with or without
+# Licensed under the Apache License, Version 2.0 (the "License");
-# modification, are permitted provided that the following conditions are
+# you may not use this file except in compliance with the License.
-# met:
+# You may obtain a copy of the License at
 #
-#     * Redistributions of source code must retain the above copyright
+#     http://www.apache.org/licenses/LICENSE-2.0
-# notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#     * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
 #
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# Unless required by applicable law or agreed to in writing, software
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# distributed under the License is distributed on an "AS IS" BASIS,
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# See the License for the specific language governing permissions and
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# limitations under the License.
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import argparse
 import datetime