Method and system for keeping digital copyright management time synchronization

Abstract

The invention relates to a method for holding time synchronization of digit version management, and a relative system, wherein a terminal device is arranged with a safe time unit for recording a device standard time or / and time slippage, the terminal device with the safe time unit processes time synchronization with a time synchronous reference device at start, based on the time synchronized result, correcting the safe time information in the safe time unit. The invention can effectively resolve the time synchronization problem of OMA DRM2. 0 and the accumulated error problem of maintenance safe time slippage when the device avoids initializing ROAP protocol, and the hard construction of safe time reference when the terminal safe time is destroyed (as power off, and data loss). The invention can realize safe clock via software without additional hardware on terminal device, with low cost.

Description

technical field [0001] The present invention relates to Open Mobile Alliance digital rights management technology, more specifically, relates to a method for providing a retention time for digital rights management in an Open Mobile Alliance Digital Rights Management System (hereinafter referred to as OMA DRM system) Methods and systems for synchronization. Background technique [0002] Recently, copyright protection technologies such as the OMA DRM system have developed rapidly and gradually gained wide acceptance. Copyright protection technology is mainly used to protect digital content including music, video, images, books, computer software, etc., and realizes the protection of digital content mainly by restricting the use and copying rights of digital content. [0003] In the OMA DRM2.0 technology, the use of the digital content of the rights object is controlled through the control parameters set in the rights object (Rights Object). For example, the number of times ...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned prior art has the following disadvantages: 1) It is necessary to initially determine the amount of difference between a standard time and the device time

In the future, when the user modifies the time, the time modification information recorded by the time security module will accumulate, which may cause error accumulation and affect the accuracy of the time

2) Once the time modification information maintained by this safe time module is lost, there is no effective means to restore it

At this time, the change of time is the change of the system time after power failure, and the time safety module cannot record the time change, which will cause the standard time calculated by the safety time module to be no longer accurate

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