METHOD AND APPARATUS FOR TRIGGERING EXPIRATION OF A DATA TAG DEVICE
First Claim
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1. A method of triggering self-expiration of an active data tag device, comprising:
- initiating a clock in the active data tag device, the clock having a clock value which changes with time;
comparing the clock value to an expiration value;
providing access to tag data stored in the active data tag device, via an interface, while the clock value has not reached the expiration value; and
disabling access to at least a portion of the tag data when the clock value reaches the expiration value.
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Abstract
The present invention discloses an active data tag device (100) which includes an expiration event generator (108), and a memory (106) which has tag data (116) stored therein. Upon the occurrence (614) of and expiration event, the tag disables access to the tag data.
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Citations
20 Claims
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1. A method of triggering self-expiration of an active data tag device, comprising:
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initiating a clock in the active data tag device, the clock having a clock value which changes with time; comparing the clock value to an expiration value; providing access to tag data stored in the active data tag device, via an interface, while the clock value has not reached the expiration value; and disabling access to at least a portion of the tag data when the clock value reaches the expiration value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active data tag device, comprising:
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a memory element for storing tag data; an interface element for facilitating communication of the tag data in response to a query received at the interface element; a clock element having a clock value, the clock value which changes with time once the clock element is initiated; a control element for comparing the clock value to an expiration value, and disabling access to at least a portion of the tag data upon the clock value reaching the expiration value; and a battery element for providing power to at least the clock element and the control element. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of operating a self-expiring active data tag device, comprising:
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detecting an occurrence of an internal expiration event; and disabling access to at least a portion of tag data stored in the self-expiring active data tag device. - View Dependent Claims (16, 17, 18)
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19. A self-expiring active data tag device, comprising:
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a machine readable storage medium containing tag data; a controller operably coupled to the machine readable storage medium; a radio interface circuit operably coupled to the controller; and an event generator coupled to the controller and configured to generate an expiration event; wherein the controller in configured to disable access to at least a portion of the tag data in response to the expiration event. - View Dependent Claims (20)
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Specification