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Digital rights management engine systems and methods

  • US 20070172041A1
  • Filed: 10/18/2006
  • Published: 07/26/2007
  • Est. Priority Date: 10/18/2005
  • Status: Abandoned Application
First Claim
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1. A method of determining whether a first entity is within a predefined proximity of a second entity, the method comprising:

  • generating a set of random number pairs at the first entity;

    sending from the first entity to the second entity encrypted information from which the second entity can derive the set of random number pairs;

    decrypting the encrypted information at the second entity;

    deriving the set of random number pairs at the second entity;

    sending an acknowledgement from the second entity to the first entity;

    measuring a first time value at the first entity;

    sending from the first entity to the second entity a first number from the set of random number pairs;

    verifying, at the second entity, that said first number is from the set of random number pairs;

    sending from the second entity to the first entity, a corresponding random number from said set of random number pairs; and

    receiving the corresponding random number at the first entity; and

    measuring a second value of time at the first entity.

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