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Besides region coding and CSS, what other “protections” are used on DVDs?

April 26, 2017coding CSS DVDs protections region Used

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Besides region coding and CSS, what other “protections” are used on DVDs?

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Macrovision describes several signals that are added to the analog output of a DVD player. Most VCRs cannot properly record from an input containing Macrovision signals. Macrovision can be enabled or disabled by bits embedded in the DVD video format. CGMS is an acronym for “copy generation management system.” It is intended to prevent copies of copies of copies. CGMS/A refers to CGMS applied to line 21 of an analog NTSC signal. CGMS/D is CGMS/Digital and is not yet finalized. Source: http://www.dvddemystified.com/dvdfaq.html#1.