How do you get rid of an insane level of copyright protection on a standard music CD?
You make session 2 (which contains data in this case) unreadable, leaving Session 1 (contains audio in this case) unadulterated. With just the audio session, the disc behaves as a normal CD on computers, letting people *gasp* turn them into something playable for their iPods.
Session 2 is on the outer part of the disc, and can be made unreadable by a single piece of sticky tape. Or a marker. But the people who discovered this easy way of bypassing Sony’s horrible DRM scheme, preferred tape.
Now if you’ll excuse me, I’ll go laugh for half-an-hour.