@sago007:
Creative Commons Attribution-Noncommercial-Share Alike is a non-free license.
Good point. But as you already mentioned, there are truly free CC licenses. Does not matter, I was just curious. If I contribute anything later, it will be GPL. I couldn't care less :-)
@fromhell:
sorry, i don't obtain
Sorry, but I don't get your meaning. The Oxford Thesaurus says:
obtain: get, get hold of, acquire, come by, procure, secure (et cetera, et cetera)
So I guess that 'to obtain' is a fairly accurate description of the process when for example some guy makes a map and contributes it to the Openarena project. OK, so it is not you personally who 'obtains', but the project. Anyway, this has nothing to do with my question on licensing.
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OK, the main point is this. Many authors making e.g. textures and skyboxes allow free usage _except_ commercial: that is explicitly forbidden in 99 percent of the cases. So if I wish to make a map for OA I can't use these free assets because the authors will probably refuse licensing under the GPL. So I have to make everything from scratch, which seems to me rather silly (and I don't really have the time for that). Of course, it is not obligatory to contribute to OA, but I would like to and just wish that the conditions imposed by licensing would make it easier. My guess is that quite a few potential contributors have been deterred by these issues.