I believe as long as the engine is free the art in games can be sold without violating the tenants of freedom. Freedom is primarily concerned with the source code.

So for example you could release a game with source code under the GNU GPL and then charge for the artwork and the game would still be free. It isn't about the price. It is about the freedom. And the game would still be free. It would be like shipping hardware with free software except in the context of a game and the artwork. While users could not sell the whole game they could sell versions of it using new artwork.

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