Visibly altering a product in response to invalidating event

This disclosure describes methods and systems for visibly altering a security card in response to detecting a change in access permission, such as an event that invalidates the card. In one implementation, a machine-readable code on the card carries an index to a database of access permission inform...

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Hauptverfasser:	MCKINLEY TYLER J, HUDSON ERIC C
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CALCULATING CHECKING-DEVICES COMPUTING COUNTING GENERATING RANDOM NUMBERS HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS REGISTERING OR INDICATING THE WORKING OF MACHINES TIME OR ATTENDANCE REGISTERS VOTING OR LOTTERY APPARATUS
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creator	MCKINLEY TYLER J HUDSON ERIC C
description	This disclosure describes methods and systems for visibly altering a security card in response to detecting a change in access permission, such as an event that invalidates the card. In one implementation, a machine-readable code on the card carries an index to a database of access permission information. A reader extracts the code from the card when its bearer presents it for validation. The reader looks up the access permission and either permits access, denies access, or invalidates the card. One mode for invalidating the card visibly alters the card so that other personnel can identify the card as being invalid through visible inspection.
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subjects	ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CALCULATING CHECKING-DEVICES COMPUTING COUNTING GENERATING RANDOM NUMBERS HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS REGISTERING OR INDICATING THE WORKING OF MACHINES TIME OR ATTENDANCE REGISTERS VOTING OR LOTTERY APPARATUS
title	Visibly altering a product in response to invalidating event
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