It depends. When you see something that's been removed from YouTube, it might have been removed as a consequence of a rights holder flagging it through the content ID system, or because of a take-down notice that Google has received under the U.S. notice-and-take-down system and that we have taken down as a result.
The thing that is important to note is that for rights holders who participate in content ID, that is, who give us their corpus of content to scan against the corpus of YouTube content to determine when there are matches, the vast majority of the participants in that program choose to monetize works when they find them to their benefit—the benefit of the rights holder.
That's not surprising. That's a system we developed as a result of arrangements with all of the major studios and independents, separate and apart from the legal regime, which provides a win-win-win for all the players in the system. It takes a tremendous amount of investment by YouTube, in person-hours, R and D, and computing resources, to run this. But as a result of that monetization system, YouTube paid hundreds of millions of dollars to record companies just last year.