Update date in copyright line
diff --git a/programs/pkey/rsa_sign.c b/programs/pkey/rsa_sign.c
index 895880f..d86fe3a 100644
--- a/programs/pkey/rsa_sign.c
+++ b/programs/pkey/rsa_sign.c
@@ -1,7 +1,7 @@
 /*
  *  RSA/SHA-256 signature creation program
  *
- *  Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  *