Security via hole(s) for printed circuit boards

Details Security via hole(s) for printed circuit boards Security via hole(s) for printed circuit boards

1998-05-15

1999-05-18

Picard, Leo P.

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

361748, 361760, 174255, 174266, 395186, 711164, 324764, 257922, G06F12/14;7/04

Patent

active

059056401

ABSTRACT:
A secure access circuit provided on a PCB (10) by designating a via hole (26) as a security via hole, storing data relating to the address and status (intact or drilled-out) of the via hole in a connectable EPROM (26), determining the status of the security via hole, and authorizing access of the EPROM only if stored data and determined status of the hole are identical. Circuit (44) can be upgraded by use of different EPROMs; by use of different PCBs with different security via holes corresponding to each upgrade, an illegally copied EPROM providing upgraded facilities by use of a printed circuit board cannot be used on a PCB (10) intended to provide only basic facilities.

REFERENCES:
patent: 4504821 (1985-03-01), Barnes
patent: 4513389 (1985-04-01), Devchoudhury
patent: 5203004 (1993-04-01), Bunton et al.
patent: 5360948 (1994-11-01), Thornberg
patent: 5459355 (1995-10-01), Kreifels
patent: 5734819 (1998-03-01), Lewis
patent: 5814847 (1998-09-01), Shihadeh et al.

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