Exploiting modulation-code redundancy
Josh N. Hogan · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1997
Redundancy in modulation coding schemes for optical storage can be exploited for copy protection purposes. Two examples are given. One is a method of storing encryption key data in a manner that will not be transferred in byte by byte copying. The other makes a copy that is likely to be error prone.