There is something about Creative Commons I never quite understood, and since many of you produce stuff I thought that you might know.
Suppose I do the following: someone releases a song under CC license on his personal website in 2010. In 2011, I decide to steal his stuff and I release a successful commercial album, claiming that I produced the song in the first place and released it in 2009 under some CC license too.
What can my victim do to prove me wrong? Since there is no official repository for CC works, what counts as "official"? I guess that the Internet archive (archive.org) does not have any legal value, especially since it does not keep track of every website. One such personal CC music website I can think about is the great http://incompetech.com/music/royalty-free/
In the case of works released under CC into Soundcloud, there is a "release date" on a famous website so this might help, but still, it's possible to replace the audio file of a track. (Not to mention the complications that could arise from changing the CC licence type of a song, which is possible.)
Otherwise I understand that CC is something that has been acknowledged by many states (including France :D), which is great. (Otherwise there would be no legal value at all...)