Add copyright to manpages

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/doc/ssl/SSL_get_rbio.pod b/doc/ssl/SSL_get_rbio.pod
index 4e91ce0..bea2018 100644
--- a/doc/ssl/SSL_get_rbio.pod
+++ b/doc/ssl/SSL_get_rbio.pod
@@ -38,3 +38,14 @@
 L<SSL_set_bio(3)>, L<ssl(3)> , L<bio(3)>
 
 =cut
+
+=head1 COPYRIGHT
+
+Copyright 2000-2016 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