Copy prevention method and apparatus for digital video system

Copy prevention method and apparatus for digital video system

  • CN 1,822,668 B
  • Filed: 11/26/1995
  • Issued: 06/25/2014
  • Est. Priority Date: 11/26/1994
  • Status: Active Grant
First Claim
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1. a copy prevention method, comprises the following step:

  • (a) from received digital video/audio stream, detect key information, described key information is for deciphering the digital video/audio content at described digital video/audio stream;

    (b) the key information that detects from digital video/audio stream of retrieval, described key information can be for detection of preventing Copy Info, described in prevent Copy Info copying for control figure video/audio content;

    And(c) according to the detected Copy Info that prevents, digital video/audio content is encrypted;

    With(d) on digital recording medium, record encrypted digital video/audio content, described in prevent that Copy Info is recorded in the head zone of digital video/audio content front end.

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