<?php /* WARNING: This file is protected by copyright law. To reverse engineer or decode this file is strictly prohibited. */
This is just a tiny portion of the PHP shell someone tried to get into the WordPress GitHub repository via a pull request. Funny thing is this code isn’t GPL compatible so it’d never get in.
As for the warning itself, no date of copyright was established, and the owner is not identified. And, since the code’s purpose is malicious, the owner would likely run into other issues should he attempt to assert his copyright.
[end of transmission, stay tuned]