Modifiable memory devices having limited expected lifetime
First Claim
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1. A memory device comprising:
- a substrate;
a data storage medium on the substrate; and
machine readable data stored in the data storage medium, the machine readable data having a first readability, the readability of at least a portion of the machine readable data modifiable by a limited expected lifetime so that following modification of readability, the modified portion of machine readable data has a second readability; and
wherein data having the first readability is readable by a first type of data read system and wherein data having the second readability is not readable by the first type of data read system.
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Abstract
Embodiments of methods and systems for controlling access to information stored on memory or data storage devices are disclosed. In various embodiments, methods of retrieving information from a data storage device previously deactivated by modification or degradation of at least a portion of the data storage device are disclosed.
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Citations
27 Claims
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1. A memory device comprising:
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a substrate; a data storage medium on the substrate; and machine readable data stored in the data storage medium, the machine readable data having a first readability, the readability of at least a portion of the machine readable data modifiable by a limited expected lifetime so that following modification of readability, the modified portion of machine readable data has a second readability; and wherein data having the first readability is readable by a first type of data read system and wherein data having the second readability is not readable by the first type of data read system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A memory device comprising:
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a data storage medium; and machine readable data stored in the data storage medium, at least one first portion of the machine readable data having a limited expected lifetime after an initial read of data, during which the machine readable data can be read from the data storage medium by a first type of data read system, and following which the readability of the at least one first portion of the machine readable data is modified so that it is unreadable by the first type of data read system. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A data storage device comprising:
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a data storage medium configured to have machine readable data stored therein, the data storage medium configured to produce a data signal in a data read device in response to an interrogation activity by the data read device, the data storage medium including; at least one modifiable portion configured to produce a data signal within a first signal range at the start of a limited read period characterized by a limited expected lifetime or limited temporal duration, and modifiable to produce a read signal falling within a second signal range subsequent to the limited read period. - View Dependent Claims (26, 27)
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Specification