Comment 9 for bug 681596

I've read Michael's explanation above, but I don't really understand the problem here, and I think it needs better explanation.

I'm struggling to understand how trademarks have anything to do with GPL compliance. The GPL deals with copyright, and not trademarks. There is no problem using a trademark in GPL code - if there were then it would not be possible to use trademarked words such as "Ubuntu", "Linux" or "drupal" in GPL licensed code.

It may be that I'm misunderstanding the problem. Can someone explain more carefully what the problem is?