We don't believe it's possible to protect digital content … What's new is this amazingly efficient distribution system for stolen property called the Internet — and no one's gonna shut down the Internet. And it only takes one stolen copy to be on the Internet. And the way we expressed it to them is: Pick one lock — open every door. It only takes one person to pick a lock. Worst case: Somebody just takes the analog outputs of their CD player and rerecords it — puts it on the Internet. You'll never stop that. So what you have to do is compete with it.

As quoted in "Steve Jobs: The Rolling Stone Interview" in Rolling Stone (3 December 2003)

Steve Jobs: The Rolling Stone Interview