This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
Not many publishers use them, and not all devices can read all of the fields.
Programs that identify audio CDs automatically don't rely on an embedded
serial number. Instead, they compute an ID based on the quantity and
positions of the audio tracks, measured down to 1/75th of a second.
http://www.cddb.com/ has a collection of CD information.