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Protection of software from physical and electronic interrogation by sealing and checking password

  • US 5,826,009 A
  • Filed: 07/25/1995
  • Issued: 10/20/1998
  • Est. Priority Date: 07/12/1990
  • Status: Expired due to Fees
First Claim
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1. A soft-ware protection (i.e. protection from to be interrogated) system for a dedicated computer comprising:

  • (a) a software-auto-destroying board (SAD board) mounted in an expansion slot of the computer;

    (b) a memory for storing the software to be protected on the SAD board;

    (c) a sealed detector, for detecting any unallowable electronical and physical interrogating (i.e. any physical and electronic interrogation which is not set up by those who designed the software protection system) externally upon the main information parts (including BIOS chip) of the computer, the detector itself, and the memory storing the software, and for generating a destruction signal in response to such detection;

    (d) means responsive to the destruction signal, for destroying the function of the memory which storing the software, so that the software stored in the memory is destroyed.(e) means for blocking the ways of controlling the computer to perform work other than that which is set up within the software stored in the memory;

    (f) means for sealing all the main information parts (including the BIOS chip) of the computer, the memory which storing the software, the detector mentioned above, and all vacant slots;

    (g) means for converting monitor-signals of the computer to video-signals, and inputting them into a video-printer to print out the outputs; and

    (h) means for, using an electronic key, starting execution of the software stored in the memory to be working, when a password input by a user is compatible with the electronic key.

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