Software Guide

134 Microsoft Windows XP Media Center Edition 2005 Reference Guide
Copy protection for DVD movies
Most DVD movies in the market are encrypted with copy
protection to prevent illegal duplication of copyrighted
material. This protection distorts the picture quality when
copied or prevents it from being copied. The following
tables shows two of the currently used copy protection
methods and their effect on playback.
CGMS*
*CGMS is Copy Generation Management System and Redistribution Control
Macrovision
n
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does not endorse or encourage the use of our
products for purposes other than those
permitted by copyright law.
Signal Method Source Record Encrypt Playback
Copy freely NTSC Yes No Unlimited
Reserved NTSC Yes No Unlimited
Copy once NTSC Yes Yes Unlimited
Copy never NTSC Yes Yes 48 hours
Signal Method Source Record Encrypt Playback
Null Any Yes No Unlimited
Detected Any Yes Yes 48 hours