Honestly my argument was more semantics. It's not DRM. It's something else, and certainly less odious. All they're doing is creating a way to track illegal activity.

I wonder what the laws are on selling the track and then deleting it though. Is that as legal as selling a cd, or do you get sign some sort of legal agreement when you purchase the track? I've never purchased a single track online so I don't know much about that.