This theme uses a encoded javascript code to insert a copyright link each time an application or plugin is added to the forum. The file "_lk_scripts.js" inside "uploads/set_resources_X" is updated every time that happens and it inserts a code. This is the code that is added.
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If you put this code on this website, you can see what the copyright code is. https://coderstoolbox.net/string/#!encoding=js&action=decode&charset=us_ascii
I have not seen a way to eliminate that system, but something simple can be done. Add this before </body>
<script>document.getElementById("lkCopyright").remove();</script>
This will remove the copyright when the page is loaded, the copyright will not be seen in the source code.