System and method for self-decaying digital media files and for validated playback of same

• US 8,767,960 B2
• Filed: 04/20/2012
• Issued: 07/01/2014
• Est. Priority Date: 04/26/2006
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Garcia, Ryan M., Peterman, Anthony E.
• Primary Examiner(s): Holder, Bradley
• Assistant Examiner(s): OLION, BRIAN L
• Application Number:
  US13/452,072
• Publication Number:
  US 20120203863A1
• Time in Patent Office: 802 Days
• Field of Search: 380/201
• US Class Current: 380/200
• CPC Class Codes: H04N 21/2353 specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 21/8402 involving a version number, e.g. version number of EPG data arrangements for version control in computers G06F8/71
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

Information, such as audio visual information, is secured by self-decay of the information over time. For instance, a date stamp and decay rate embedded in an encrypted audio or visual digital media file can be applied to decrypt the file to a predetermined decayed state, such as a degraded playback quality. One or more keys can be included with the information to allow undecayed decryption but expire after use or a predetermined time period. In one embodiment, the decayed state can comprise gaps formed at intervals in the information, the gaps having increased length for decreased quality. In an alternative embodiment, the decayed state can be a reduced sample rate for a compressed digital media file.

Claims

1. A method for validating a current date from an information handling system, the method comprising:

obtaining a current system date stored on the information handling system;

determining whether a current network date is available and obtaining the current network date if available;

identifying a file date from at least one file stored on the information handling system and obtaining the at least one file date;

wherein the file stored on the information handling system is an operating system swap file;

comparing the current system date, the current network date if available, and the at least one file date; and

validating the current system date as representing an actual current date if the current system date is equal to or within a predetermined number of days greater than the current network date if available and the at least one file date.

2. The method of claim 1 further comprising using the validated current system date for decaying information content of a digital media file.

3. The method of claim 1 wherein identifying a file date from at least one file stored on the information handling system and obtaining the at least one file date further comprises identifying the file date from at least a boot log file stored on the information handling system and obtaining the boot log file date.

4. The method of claim 1 wherein identifying a file date from at least one file stored on the information handling system and obtaining the at least one file date further comprises identifying the file date from at least a file having a date reflecting a modification of information stored in the file and obtaining the date reflecting the modification.

5. The method of claim 1 wherein identifying a file date from at least one file stored on the information handling system and obtaining the at least one file date further comprises identifying the file date from at least a boot log file and a date reflecting modification of information stored in a file.

6. The method of claim 1 wherein the network date comprises a network access log file.

7. The method of claim 1 wherein the network date comprises a date retrieved from a network gateway.

8. The method of claim 1 wherein the network date comprises a date retrieved from a network router.

9. The method of claim 1 wherein the file date comprises an operating system log file.

10. The method of claim 1 wherein the file date further comprises at least a boot log file date, an operating system log file date, an operating system swap file date and a latest file modification date present in the file system.

11. The method of claim 10 wherein the network date comprises an Internet access log file date.

12. A method for validating playback of digital media files on a stand alone media player device, the method comprising:

establishing a communication link between a media player device and a host information handling system;

verifying that the host system has a validated current system date by comparing a current system date of the host system with an operating system swap file date of the host system;

allowing, in response to the verifying, a file storage of the media player device to be available for reading or writing of digital media files; and

storing the validated current system date on the media player device and associating the validated current date with digital media files stored on the media player device.

13. The method of claim 12, further comprising using the validated current system date for decaying information content of a digital media file.

14. The method of claim 12 wherein verifying that the host system has a validated current system date further comprises comparing the current system date with plural file dates, the plural file dates including at least a host boot log file date and a date reflecting modification of information stored in a file of the host.

15. The method of claim 14 wherein verifying that the host system has a validated current system date further comprises comparing the current system date with a network access log file date.

16. A method for validating playback of digital media files on a stand alone media player device, the method comprising:

verifying that a host system has a valid current system date by comparing a current system date of the host system with an operating system swap file date of the host system; and

in response to the verifying, storing the valid current system date on the media player device and associating the valid current system date with digital media files stored on the stand alone media player device.

17. The method of claim 16, further comprising using the valid current system date at the stand alone media player device for decaying information content of one or more of the digital media files.

18. The method of claim 16 wherein verifying that the host system has a valid current system date further comprises comparing the current system date with plural file dates, the plural file dates including at least a host boot log file date and a date reflecting modification of information stored in a file of the host.

19. The method of claim 16 wherein verifying that the host system has a validated current system date further comprises comparing the current system date with a network access log file date.