actually the basic CC licence is not that rigid ; i think the most basic version requires only that the author of the work be credited (attribution). there are other components which can be specified depending on the creator's intentions. see
http://en.wikipedia.org/wiki/Creativ...mmons_Licenses
there's also the copyleft movement which is another very interesting point of view, by the way :
http://en.wikipedia.org/wiki/Copyleft