Linked by boldingd on Tue 29th Jan 2013 23:12 UTC

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Member since:
2010-01-21
Yeah. It's a common way for companies to open-source the engines for games like DOOM and Arx Fatalis.
It's also how free games like Sauerbraten and Frogatto and Friends are done. The engines are open-source and you're encouraged to reuse them but the default assets bundle is merely freely redistributable with no derivatives allowed.
(Frogatto and Friends was actually written specifically to encourage more 2D indie platformers by providing a good free engine and an example of what it can do and how it's used)
The inverse is also popular with indie games. (Using things like music and art assets under licenses like CC-BY-SA)
GPLed code doesn't affect assets unless they're compiled right into the executable binary because there's no code linking going on and Creative Commons assets don't affect code for the same reason.
(Copyleft licenses cover derivation, not aggregation)