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Security enhanced tiered subscription broadcast system

  • US 7,865,917 B2
  • Filed: 12/16/2005
  • Issued: 01/04/2011
  • Est. Priority Date: 12/17/2004
  • Status: Active Grant
First Claim
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1. A receiver in a tiered broadcast system comprising:

  • a digital demodulator;

    a cryptoprocessor; and

    a receiver controller;

    such that;

    said digital demodulator creates a bitstream;

    said receiver controller divides said bitstream into at least two substreams;

    at least one of said substreams is plaintext;

    at least one of said substreams is ciphertext;

    at least one of the ciphertext substreams is decrypted by said cryptoprocessor;

    if said receiver is assigned to a first tier and tuned to a program channel for a time period greater than ten minutes, advertising comprises a first time fraction of said receiver'"'"'s output signal;

    if said receiver is assigned to a second tier and tuned to said program channel for said time period, advertising comprises a second time fraction of said receiver'"'"'s output signal; and

    the ratio of said first time fraction to said second time fraction is less than 0.95 or greater than 1.05.

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