The short answer is that we've invested $30 million developing the system and over 50,000 hours of engineering time, and it's not a solved problem yet. It's very complicated because the manner in which rights are divided up is very complicated. The manner of deals within the industry is complicated, and it's tough to keep all of those balls in motion, but we do our best to find ways to remunerate artists, keep fans' material up as much as possible, and balance free speech. So we try to find a win-win-win.
On March 1st, 2012. See this statement in context.