I’ve always felt that the whole CC thing was based on an unexamined assumption that artists were to art what programmers were to code. Given that many of the people pushing CC were programmers given to thinking of themselves as artists, this is unsurprising. But I think that actually talking to artists outside the tech world (and here I’m probably over-generalizing) you find that they relate to their products in ways very different from the ways programmers do. A colleague of mine is doing the hard work of studying users of Deviant Art for his dissertation and is turning some interesting evidence of this. But even anecdotally, I saw this tension at work on the mailing list for the CC Sampling License when it was being developed.