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Digital rights management using trusted time

A credible, time-valued technology, applied in electrical digital data processing, digital transmission system, image communication, etc., can solve the problem that the client system clock is easy to be tampered with

Active Publication Date: 2009-03-25
SONY ELECTRONICS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, client system clocks are often susceptible to tampering, making it possible to bypass time-based rules in some cases

Method used

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  • Digital rights management using trusted time
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Examples

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Embodiment Construction

[0023] Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. It is understood that other embodiments may be utilized and structural and operational changes may be made without departing from the scope of the present invention.

[0024] Embodiments of the invention include methods and systems for monitoring data so that use of protected content can be controlled. The client device receives a trusted time value from a trusted authority external to the client, rather than relying on the client's system clock, which is easily tampered by the user. When the client is no longer in communication with the trusted authority, the previously received trusted time value is updated by using the client's operating system counters to obtain a calculated updated trusted time value for content license evaluation purposes.

[0025] Accor...

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Abstract

A method for monitoring time so that the use of protected content can be controlled includes receiving a trusted time value from a trusted authority external to a client device. When the client is no longer in communication with the trusted authority, the previously-received trusted time value is updated by use of the client's operating system counter so that a calculated trusted time value is derived for content license evaluation purposes.

Description

[0001] Inventors: Marc E. Strohwig, Yoji Kawamoto, Motohiko Nagano, Pierre Chavanne, Norifumi Goto, Oscar H. Steele, III, Eric John Swenson technical field [0002] The present invention relates to digital rights management for content protection. More specifically, the present invention relates to digital rights management using trusted time received from a trusted authority. Background technique [0003] Providers of digital video content, audio content, computer applications, and the like are often reluctant to deliver these items over the Internet or otherwise without effective protection. While technology exists for providers to deliver content over the Internet, digital content by its very nature can be easily copied with or without the owner's authorization. The Internet allows the delivery of content from the owner, but the same technology also allows for the widespread distribution of unauthorized copied content. [0004] Digital Rights Management (DRM) is a digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04N7/167
CPCG06F21/725G06F21/10H04N7/1675Y10S705/901H04N21/2541H04N21/2543H04N21/8355H04N21/2347H04L69/28H04N21/4627
Inventor 马克·E·斯特惠格川本洋志长野元彦皮埃尔·查瓦南后藤礼史奥斯卡·H·斯蒂尔三世埃里克·约翰·斯文森
Owner SONY ELECTRONICS INC