DRM and Copyrighting is getting out of hand. I'm of the opinion that these companies don't even know why they're doing it any more. They're just doing it.
My reasoning comes from how I've noticed that some Youtube videos have their audio muted because their backing tracks "infringe copyright".
To me, this is a perfect example of what's wrong with copyright, because the artist who created the track which was then later used in the youtube video would get BETTER sales through the free advertising that is having your track played with some cool video. How often have you heard an advert's music and wondered where to get the track, or watched a film or tv show and again, wanted to know the origin of the music so you could go get it?
To me, it looks like the current methods of copyright enforcement are a theft of opportunity to those who have copyright.
If I were a publishing company, I'd welcome any people giving me free advertising, mostly because that's pretty much the only advertising I trust anymore.