Data retrieval methods

• US 8,140,745 B2
• Filed: 09/09/2005
• Issued: 03/20/2012
• Est. Priority Date: 09/09/2005
• Status: Expired due to Fees

• Current Assignee: The Invention Science Fund I, L.L.C. (Intellectual Ventures LLC)
• Original Assignee: The Invention Science Fund I, L.L.C. (Intellectual Ventures LLC)
• Inventors: Ferren, Bran, Jung, Edward K. Y.
• Primary Examiner(s): Alsip, Michael
• Application Number:
  US11/223,898
• Publication Number:
  US 20070061370A1
• Time in Patent Office: 2,384 Days
• Field of Search: 711/112, 711/154, 713/194, 369/53.12, 369/53.15
• US Class Current: 711/112
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06F 2221/2137 Time limited access, e.g. to a computer or data
• CPC Class Codes: G06F 2221/2143 Clearing memory, e.g. to prevent the data from being stolen
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00608 wherein the material that the record carrier is made of is altered, e.g. adding reactive dyes that alter the optical properties of a disc after prolonged exposure to light or air
• CPC Class Codes: G11B 20/00666 involving a step of erasing or nullifying data, e.g. data being overwritten with a random string
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date

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.

Claims

1. A method of retrieving data from an expired limited use memory device, comprising:

recovering read-support information necessary for reading machine readable data of interest from the expired limited use memory device using a special-purpose data read system, the expired limited use memory device including a degraded first portion from which read-support information could be read prior to, but not following, expiration of the memory device with a general-purpose data read system, and at least one second portion containing the data of interest; and

reading data of interest from the at least one second portion of the expired limited use memory device through the use of the read-support information recovered from the expired limited use memory device.

2. The method of claim 1, including recovering read-support information from the degraded first portion of the limited use memory device.

3. The method of claim 2, including recovering read-support information from the degraded first portion of the limited use memory device using a data read system operating at a reduced scanning speed relative to a general-purpose data read system.

4. The method of claim 2, including recovering read-support information from the degraded first portion of the limited use memory device using a data read system that performs signal averaging on the read data.

5. The method of claim 4, wherein the data read system performs a moving average on the read data.

6. The method of claim 4, wherein the degraded first data portion includes two or more degraded copies of the read-support information, and wherein the data read system averages the two or more degraded copies of the read-support information.

7. The method of claim 1, including recovering read-support information distributed among the data of interest in the at least one second portion of the limited use memory device using a special-purpose data read system including extraction software.

8. The method of claim 7, wherein the extraction software includes at least one function.

9. The method of claim 7, wherein the extraction software includes at least one HASH function.

10. The method of claim 7, wherein the extraction software includes at least one decryption function.

11. The method of claim 7, wherein the extraction software uses at least one lookup table.

12. The method of claim 1, including recovering read-support information that includes complete information necessary for reading the data of interest.

13. The method of claim 1, including recovering read-support information that is a subset of information necessary for reading the data of interest.

14. The method of claim 1, including recovering partial read-support information from the degraded first portion of the limited use memory device and recovering complimentary partial read-support information from the at least one second portion of the limited use memory device, wherein the partial read-support information and complementary read-support information together are sufficient to support reading of the data of interest from the at least one second portion of the limited use memory device.

15. A method of retrieving data from an expired limited use memory device, comprising:

reading read-support information from an expired limited use memory device with a special purpose read system, the read-support information of the expired limited use memory device readable by a special purpose read system but not a general purpose read system; and

reading data of interest from the expired limited use memory device with the use of the read-support information.

16. The method of claim 15, including decrypting the data of interest, wherein the read-support information includes a decryption key.

17. The method of claim 15, including locating and sequencing the data of interest, wherein the read-support information includes index information.

18. The method of claim 15, including reading the read-support information from the expired limited use memory device with the use of a noise reduction technique.

19. The method of claim 18, wherein the noise reduction technique includes a thresholding operation.

20. The method of claim 18, wherein the noise reduction technique includes performing a moving average.

21. The method of claim 18, wherein the noise reduction technique includes performing signal averaging.

22. The method of claim 15, wherein reading the read-support information from the expired limited use memory device includes using an error detection technique including an error detection code.

23. The method of claim 15, wherein reading the read-support information from the expired limited use memory device includes using an error correction code.

24. A method of retrieving data from an expired limited use memory device, comprising:

reading at least one first portion of machine readable data from an expired limited use memory device with a high-sensitivity read, the at least one first portion having a decreased signal-to-noise ratio relative to the signal-to-noise ratio of the at least one first portion prior to expiration of the limited use memory device.

25. The method of claim 24, including reading at least one first portion of machine readable data from an expired limited use memory device with a high-sensitivity read device that performs signal averaging on the at least one first portion.

26. The method of claim 24, including reading at least one first portion of machine readable data from an expired limited use memory device with a high-sensitivity read device that performs a thresholding operation on the at least one first portion.

27. The method of claim 24, including reading at least one first portion of machine readable data from an expired limited use memory device with a high-sensitivity read device comprising normal-sensitivity read-device hardware configured with special purpose software or firmware.

28. The method of claim 24, including reading at least one first portion of machine readable data from an expired limited use memory device with a high-sensitivity read device that includes special purpose hardware components.

29. The method of claim 24, including using information contained in the at least one first portion of machine readable data to enable reading of data from at least one second portion of machine readable data on the expired limited use memory device.

30. The method of claim 29, wherein the at least one second portion of machine readable data on the expired limited use memory device has a signal-to-noise ratio substantially the same as the signal-to-noise ratio of the at least one first portion prior to expiration of the limited use memory device.