He's right in a sense. You "purchase" not a CD but a permission to use the CD. The real question is: How much resources should be expended by law enforcement to find and punish people who trespass said "bought permission"? Given the permission being sold, I say not much.
It's more like the clothing store saying: I don't sell socks, I sell permissions to use socks. If you plan to use your socks with shoes that's a whole other permission. That permission is sold separately.