There is no copy protection possible with audio CDs. They are nothing but
a string of digitized values and a simple index.

Some audio CD's are created with an eccentric spiral track pattern.
Domestic CD players are supposed to tolerate this; some don't. PC CD
drives are supposed to fail on these; most don't. It's a primitive copy
protection mechanism, defeated mostly by the economics.

It's also the difference between cheap writeable blank CD's and their
more expensive "Audio" versions - the audio versions have the eccentric
pattern, so are less likely to work in other PC's.


--
Steve Swift
http://www.swiftys.org.uk/swifty.html
http://www.ringers.org.uk