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Method for protecting the audio/visual data across the NRSS interface

  • US 6,409,089 B1
  • Filed: 03/13/2001
  • Issued: 06/25/2002
  • Est. Priority Date: 12/10/1997
  • Status: Expired due to Term
First Claim
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1. A method for protecting the output audio/visual stream of a smart card comprises the steps of:

  • (a) receiving a scrambled signal from a source external to said smart card;

    (b) generating a descrambling key in response to said received signal;

    (c) descrambling said received signal using said descrambling key to generate a descrambled signal;

    (d) receiving data from said external source;

    (e) generating a scrambling key in response to said received data;

    (f) scrambling said descrambled signal using said scrambling key to generate a rescrambled signal; and

    , (g) providing said rescrambled signal to said external source.

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