Posted by Barbara on 02/28/07 18:33

HD DVD is one of two leading high-definition video disc formats
attempting to replace DVDs. An HD DVD disc can store about four times
as much data as a DVD disc and it supports playback of "true" high-
definition video. In addition, HD DVDs have more advanced copy
protection than DVDs. The movie industry has been trying to shift the
market away from DVD and towards high-definition formats partly
because DVDs have become so easy to copy....

http://technowiki.blogspot.com/2007/02/copy-protection-used-on-hd-dvd-and-blu.html

Enjoy !!

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