Why can Hulk Hogan use his name anywhere?

What I mean is, Hulk Hogan's real name is Terry Bollea, but he calls himself Hulk Hogan everywhere, including WWE, WCW and TNA. What I don't understand is how is he allowed to do that? When Kevin Nash and Scott Hall "invaded" WCW as the NWO all those year ago, they weren't allowed to be called... show more What I mean is, Hulk Hogan's real name is Terry Bollea, but he calls himself Hulk Hogan everywhere, including WWE, WCW and TNA. What I don't understand is how is he allowed to do that? When Kevin Nash and Scott Hall "invaded" WCW as the NWO all those year ago, they weren't allowed to be called Diesel and Razor Ramon, and in fact, WWF sued WCW for trademark infringement anyways.
So why didn't they do the same with Hogan? Why arne't they suing TNA now?
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