It would be the same if you say, use one engine to the next. The only thing you are being charged for is using the engine. The company providing the engine do not own any content you produce. The only thing that TGC would really own is FPSCreator and the media.
That's it. They won't own any of the characters etc.. you develop. However you still need a license to sell the games regardless if you develop the media yourself. We won't know until a little before or a little after V1 how that will all work.
SoulMan
This is as backwards as is This