I want to step in there, because I had uploaded a radio documentary I had done and the registry had picked some of the background music, which had been paid for. YouTube erased the content, and we had to make a filing. I think it was under Warner's catalogue. Warner said it was a fair use. It seems to me that this is a pretty sophisticated system. Yet what I thought was a fair use of my own work was stopped.
On March 1st, 2012. See this statement in context.