diff --git a/library/arc4.c b/library/arc4.c
index aa5e3a2..7ff747d 100644
--- a/library/arc4.c
+++ b/library/arc4.c
@@ -2,19 +2,7 @@
  *  An implementation of the ARCFOUR algorithm
  *
  *  Copyright The Mbed TLS Contributors
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
  */
 /*
  *  The ARCFOUR algorithm was publicly disclosed on 94/09.