CGMS-A

Apr 21, 2026 - 16:44

0 0

Remove information that is next to impossible to source. It's apparently also illegal.

← Previous revision		Revision as of 11:13, 21 April 2026
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	*CopyNoMore was not a part of the original standard. The 0,1 value originally was "Reserved".		*CopyNoMore was not a part of the original standard. The 0,1 value originally was "Reserved".

	== Removal ==
	The signal itself can be easily stripped by normalizing the VBI, e.g. using a video stabilizer to counter the side effects from [[Macrovision]]'s manipulation of the VBI. CGMS-A VBI data is commingled or generally near captioning signals, so removal of CGMS-A will likely remove [[Closed captioning\|captioning]] as well.

	The scheme can be made more robust by adding the [[Video Encoded Invisible Light\|VEIL Rights Assertion Mark]] (RAM); when the RAM is present but CGMS-A is not, copying is denied, turning the scheme into a permission-based one. The RAM can be encoded by using the [[Video Encoded Invisible Light\|VEIL]] technology.

	==References==		==References==