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Encryption of signals to insure viewership of commercials

  • US 5,555,308 A
  • Filed: 11/10/1994
  • Issued: 09/10/1996
  • Est. Priority Date: 11/10/1994
  • Status: Expired due to Fees
First Claim
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1. In a broadcast signal transmission system, including a broadcast message, a method for distributing digital data to a plurality of receivers, said method comprising:

  • generating a key code;

    encrypting said digital data using said key code to form an encrypted digital data packet;

    combining said key code with said broadcast message to form a combined broadcast message, said key code being unencrypted;

    transmitting said combined broadcast message to form a broadcast message; and

    transmitting said encrypted digital data packet; and

    at each of said plurality of receivers,receiving said broadcast message;

    displaying said broadcast message;

    receiving said key code from said displayed broadcast message;

    receiving said encrypted digital data packet;

    manually entering said key code at said receiver to form a manually entered key code; and

    decrypting said encrypted digital data packet using said manually entered key code.

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