Decrypting the Encrypted footer of wordpress themes is realy a mess. It is basically a base_64 endcoded string. But decrypting it is not easy. Ottodestruct made a nice decoder of these string for decrypting and editing the footer of free wordpress themes. You can copy the decoded PHP footer and change the name of the company and some unwanted advertising links present in the footer.
If you have some sidebar items or can’t access some sections of your blog theme to edit you may want to look through your footer.php to see if the content you need is there.
This PHP Decrypter tool will decode your footer.php so you can re-save the file in clear text and modify it as you need to.
You cut/paste your footer.php content but remove the at the end.
Note: Some footer.php files are double encoded and cannot be decoded by this method, it is also a violation of some copyrights to decode and modify some footer.php files. You will have to check the license associated with your theme, in all cases if you do decode the footer.php leave the original author intact and only make cosmetic changes for your blog, don’t try to alter the theme or take credit for a theme you didn’t create.
This page will let you decode the encryption that seems most commonplace, the one that looks like
I based the interface for it off of this one, which will decode the type of encryption that starts with
Another one is here, for those that look like