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Method for partially encrypting program data

  • US 8,548,166 B2
  • Filed: 06/25/2003
  • Issued: 10/01/2013
  • Est. Priority Date: 04/03/1995
  • Status: Expired due to Fees
First Claim
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1. A method for providing an instance in a conditional access system, the method comprising the steps of:

  • selecting for encryption a digital bit stream from a plurality of digital bit streams using a packet identifier;

    encrypting the selected digital bit stream according to a first level encryption method to provide an encrypted instance prior to combining the encrypted instance with the plurality of digital bit streams to provide a partially-encrypted bit stream; and

    transmitting the partially-encrypted bit stream.

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