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Process for protecting an information item transmitted from a security element to a decoder and protection system using such a process

  • US 6,266,415 B1
  • Filed: 11/12/1997
  • Issued: 07/24/2001
  • Est. Priority Date: 11/13/1996
  • Status: Expired due to Term
First Claim
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1. A method for protecting a stream of data output from a security element comprising:

  • receiving a signal scrambled using control words from a source external to said security element, said scrambled signal comprising a data component and a control component;

    generating a control word in response to said control component of the scrambled signal;

    descrambling said data component using said control word to generate a descrambled data component;

    encrypting said descrambled data component using a first key to generate a re-encrypted data component; and

    providing said re-encrypted data component to said external source.

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