Update headers
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 6754148..aa28259 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -2,7 +2,7 @@
* TLS 1.3 key schedule
*
* Copyright The Mbed TLS Contributors
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*
* Licensed under the Apache License, Version 2.0 ( the "License" ); you may
* not use this file except in compliance with the License.