Importance

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Abstract

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 external interrogation by reason of being stored in an internal non-volatile memory of the microprocessor. The private access code is preferably selected by and known only to the user, and may be changed to a different private access code at the user's option.

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First Claim