O.K. I've written my "worlds fastest" life engine, and now I want to release it as open source. It's of no commercial value, but I don't want bad people to pass it off as their own work, or distribute messed-about versions with my name on it. I do want people to be able to use it as the basis for a complete program however.
So should I GPL it? Or just rely on copyright?
Any advice would be gratefully received.