Yeah, it may be impossible to edit
If you look over on the themes section of this forum, up at the top in the stickies, there is a decoding thread, where they tell you how to decode that stuff, and volunteers also decode themes
But my experience has been that usually there is a function built into themes like this that checks for edits.
Basically, it turns it into a fair bit of coding to remove the links. Probably far more effort than its worth.
If you want to get rid of the links, it may be best to get a reputable theme, and go from there. There's no reason to have other people freeloading links on your site in my opinion.....