I agree also with everything said. The author's name it's a worth. I made some stuff and my name is there=credit. But I'll always be happy just to see that stuff around the net giving people some fun. I bet there's someone else right now playing Gp3 with my 2006 modifications without knowing who I am, and I'm happy in the same proportion.
I am not holding a flag "Destroy authors credit", away from this. But I really think we could find a way to make it more easy, and it's not hard to do. I remember when playing and creating for Gp2, authors use to put their names into the car bitmaps, as a "digital" signature, and IMO this could be done in Gp3 stuff, this way you'd have no stolen works.
Now, talking about respect for the authors, this is also important for me. When I modify someone's work I don't say it's my creation, but my modification, I never say someone's work is mine, no one needs that.
At the end I'm speaking, speaking... and not sure if I'm making me clear... sorry guys, no offense. Without you all I know gp3 would not live that long, and for this I'm always thankfull.