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.

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CGMS*

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

 

 

 

 

 

*CGMS is Copy Generation Management System and Redistribution Control

 

 

Macrovision

 

 

 

 

Signal Method

Source

Record

Encrypt

Playback

 

 

 

 

 

Null

Any

Yes

No

Unlimited

 

 

 

 

 

Detected

Any

Yes

Yes

48 hours

 

 

 

 

 

134Microsoft Windows XP Media Center Edition 2005 Reference Guide