I am wondering about the legality of copyright notices and encrypted bits of code in WordPress themes. Usually a copyright notice looks like this and it may or may not have encrypted code under it:
<!-- WARNING: DO NOT CHANGE THE FOLLOWING CODE, CHANGING IT WILL VIOLATE THE COPYRIGHT AND STOP THE THEME WORKIN AUTOMATICALLY -->
Considering that WordPress itself is licensed GNU/GPL, is it legal for theme designers to include encrypted footer links and copyright notices within the footer.php file or other files?