"You're not buying music, you're buying a key," says Larry Kenswil, the president of the eLabs division of the Universal Music Group, the world's largest record company, which recently started charging 99 cents for a digital single that can be burned to a CD but not copied to certain portable devices, like the Apple iPod. "That's what digital rights management does: it enables business models."

From "Studios Using Digital Armor to Fight Piracy"