I think that game industry's reliance on the proprietary model is somewhat odd because they could do a really nice code is open source, but the art assets, soun

I think that game industry's reliance on the proprietary model is somewhat odd because they could do a really nice code is open source, but the art assets, sounds, etc. are licensed. Let people have and modify the engine, and if they purchased the game, they're free to add or do whatever, but no one can take your assets and resell them legally.