Maybe this helps: http://arstechnica.com/apple/news/2011/06/what-you-need-to-know-about-itunes-match-your-questions-answered.ars http://arstechnica.com/apple/ne

Maybe this helps: http://arstechnica.com/apple/news/2011/06/what-you-need-to-know-about-itunes-match-your-questions-answered.ars http://arstechnica.com/apple/news/2011/06/what-you-need-to-k... So it does scan, not require an upload unless it's not matched. Very interesting. It's not a service I'll be using, though.