Now OpenSource (kind of ideology) is the one that is opposing this
Stop trolling.
Oh but I am not, my intelligence challenged cupcake
In fact game play CAN BE PATENTED (copyrighted actually too... well some fucking kind of infringement as asshole corporations call their imaginary property).
There was a story of clone (or remake?) of X-COM Apocalypse from microprose (best tactical game ever).
They abandoned their project afair from serious fears regarding owners of xcom intellectual so-called property suing them because they recrated same *gameplay*.
EDITED hmm not sure, was it ufo2000? their forum is down where they (or similar game) announced such end.
@rotack are you sure that just using some assets will make entire game using them as forced open source?
You know what you can do probably?
Auto-install our good old tremulous GPP while installing trem2.
And make tremulous2 use the GPP's granger sound if installed.
(but I'm not a lawyer currently)