Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event

Abstract From the Canadian patent

A lock-out security arrangement for and method of maintaining microprocessor-controlled electronic equipment normally operational until the occurrence of a disabling event, such as physical removal of the equipment from its normal installation, and/or electrical removal of the equipment from a source of electrical power and thereupon for, disabling the equipment after detecting the disabling event and for maintaining the equipment disabled even after, the disabling event has been discontinued until a code, manually entered via a keyboard associated with a microprocessor for controlling the normal operation of the equipment matches a private access code whose identity is protected from …