×

Method and system for a recursive security protocol for digital copyright control

  • US 9,710,617 B2
  • Filed: 01/18/2013
  • Issued: 07/18/2017
  • Est. Priority Date: 06/20/2002
  • Status: Active Grant
First Claim
Patent Images

1. A system, comprising:

  • a target device, comprising;

    a processor,first hardware comprising a one time programmable immutable target unit specific key, wherein the target unit specific key cannot be read by software executing on the target device, andsecond hardware configured to be written with an activation key, wherein the activation key is based on the target unit specific key, and wherein the target device is configured to;

    receive a first bit stream,obtain a first decryption algorithm associated with the first bit stream in association with a first digital signature based on the first decryption algorithm and the target unit specific key,obtain the target unit specific key and the activation key, anddecrypt the first bit stream to yield a first decrypted bit stream, wherein the decryption of the first bit stream is accomplished utilizing the first decryption algorithm associated with the first bit stream, using a temporary decryption key generated from the target unit specific key and the activation key, and wherein the decryption of the first bit stream using the first decryption algorithm cannot occur unless the first digital signature of the first decryption algorithm matches a second digital signature calculated by the target device based on the target unit specific key.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×