Add copyright

Reviewed-by: NRichard Levitte <levitte@openssl.org>

doc/crypto/pem_read.pod

@@ -88,3 +88,14 @@ See L<pkcs8(1)> and L<pem(3)> and L<d2i_PKCS8PrivateKey_bio(3)>.
 
 L<pem(3)>, L<ERR_peek_last_error(3)>, L<ERR_GET_LIB(3)>, L<pkcs8(1)>,
 L<d2i_PKCS8PrivateKey_bio(3)>.
+
+=head1 COPYRIGHT
+
+Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut