Copy protection for hybrid digital video tape recording and unprotected source material

  • US 5,315,448 A
  • Filed: 03/18/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 03/18/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for playing back material digitally recorded on a recording medium, comprising:

  • a mechanism for playing the recording medium;

    a digital output terminal operatively connected to the mechanism for providing a digital signal from the mechanism;

    a digital to analog converter operatively connected to the mechanism for converting the digital signal to an analog signal;

    an analog output terminal for providing an analog signal from the digital to analog converter;

    a signal detector for detecting copy protection information present in the digital signal; and

    a signal generator for generating an analog copy protection signal in response to the detected copy protection information, and modifying the analog signal with the generated signal.

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