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System and method for conditional access key encryption

  • US 20030035543A1
  • Filed: 08/15/2001
  • Published: 02/20/2003
  • Est. Priority Date: 08/15/2001
  • Status: Active Grant
First Claim
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1. A computer-implemented method comprising:

  • encrypting a group of multimedia channel keys using a first type of encryption to produce a first group of encrypted multimedia channel keys;

    encrypting said group of multimedia channel keys using a second type of encryption to produce a second group of encrypted multimedia channel keys;

    concurrently transmitting said first group of encrypted multimedia channel keys with said second group of multimedia channel keys to a plurality of multimedia subscribers having multimedia receivers capable of decrypting either said first group of encrypted multimedia channel keys and/or said second group of multimedia channel keys.

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