Midbar Tech ANTI-COUNTERFEIT COMPACT DISC

US patent No.: 6,208,598 (www.freepatentsonline.com) says:

“Regarding information recorded in a data section, standard 908 dictates that where the P-channel=0 the digital audio information may be passed to a digital-to-analog converter for output via a speaker, and where the P-channel=1 it may not.”

I’m very confused after reading this… and I think that patent can’t be implemented as described. What do you say? Could P work as a concealment flag?

Thanks in advance.