User blog comment:Drkdragonz66/Call of Duty: Iron Wolf?/@comment-3171236-20111231164704/@comment-3123696-20111231175358

R is for Registered Trademark, usually used by the person who made the thing that has the ®.

C is for copyrighted trademark, which is usually used by someone that has no relationship to the makers of said thing. Usually for not getting in legal issues, giving credit to the person who has the trademark registered.

I guess that debunks this.