×

Method for detecting unauthorized modification of a communication or broadcast unit

  • US 5,502,831 A
  • Filed: 08/13/1993
  • Issued: 03/26/1996
  • Est. Priority Date: 02/26/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. In an RF communication system that includes a plurality of communication units, wherein each of the communication units includes at least one module and at least one software program, a method of detecting an unauthorized modification of a communication unit of the plurality of communication units, the method comprises the steps of:

  • a. detecting, by the communication unit, expiration of a predetermined time period;

    b. when the predetermined time period has expired, transmitting, by the communication unit, a message via an RF communication resource, wherein the message includes a unit identification code and an assembly code, the assembly code based on, at least in part, an identification code of the at least one module and an identification code of the at least one software program;

    c. receiving, by an RF receiver, the message;

    d. transporting the message from the RF receiver to a database unit;

    e. accessing, by the database unit, a stored assembly code based on the unit identification code;

    f. comparing, by the database unit, the assembly code to the stored assembly code;

    g. indicating, by the database unit, that an unauthorized modification of the communication unit has occurred when the assembly code does not substantially match the stored assembly code.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×