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Interactive television security through transaction time stamping

  • US 5,764,275 A
  • Filed: 06/07/1995
  • Issued: 06/09/1998
  • Est. Priority Date: 11/20/1991
  • Status: Expired due to Term
First Claim
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1. A method for preventing cheating on an interactive presentation system, comprising the steps of:

  • receiving a plurality of sets of interactive data;

    determining whether any of said sets of interactive data are delayed as compared to each other, wherein;

    said step of determining whether any of said sets of interactive data are delayed as compared to each other includes the steps ofcomparing time stamps from said sets of interactive data to a first clock in a handheld apparatus, andcalculating a stored delta representing a difference between a reading of said first clock and a time value represented by a time stamp from a set of interactive data determined not to be delayed as compared to other sets of interactive data;

    determining a difference between said first clock and a second clock at an operations center which is remote from said handheld apparatus; and

    comparing said difference to the stored delta.

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