I remember when Rock started doing movies he went by Rock at first instead of Dwayne Johnson because Rock was already recognizable and a kind of household name.
but in order to do that he needed Vince's permission, thus Vince was credited as executive producer or something like that for the movie scorpion king. he had nothing to do with the movie or the filming, just solely because he owned the name.
that smart bastard. I don't know how accurate or the exact details but I remember howard stern talking about it on his show