OMA DRM mobile stream media rights management system facing multicast service

A multicast service and copyright management technology, which is applied in the branch office to provide special service devices, transmission systems, digital transmission systems, etc., can solve the problems that multicast services cannot be directly applied

Inactive Publication Date: 2009-10-28
泛联智城(北京)国际科技有限公司
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AI Technical Summary

Problems solved by technology

Other content protection schemes using multi-layer encryption systems such as conditional access mainly consider broadcast or unicast services and cannot be directly applied to multicast services

Method used

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  • OMA DRM mobile stream media rights management system facing multicast service
  • OMA DRM mobile stream media rights management system facing multicast service
  • OMA DRM mobile stream media rights management system facing multicast service

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Embodiment Construction

[0035] 1) Server-side multicast user logical grouping process

[0036] The logical grouping process of multicast users is one of the core contents of the present invention. Through the logical grouping mechanism, it is avoided to assign different content encryption layer 2 keys for each multicast user, and the transmission of multiple secondary encrypted content encryption keys is reduced. The bandwidth consumption generated by the key and its digest provides efficient support for a large number of multicast users. And an effective logical grouping strategy plays a very critical role in effectively preventing multiple multicast receivers from sharing content encryption keys. The specific process (see attached figure 2 )as follows:

[0037] ① The server obtains the information of the newly added user, if the number of current multicast receivers is less than 20, assign the multicast receiver to a logical group without other multicast receivers; otherwise, go to step 2;

[0...

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Abstract

The invention relates to a mobile stream media digital rights management system facing a multicast service, which adopts a multilayer encryption mechanism, a video watermark authentication mechanism, a logic grouping mechanism and the like based on compatible OMA DRM 2.0 standard. A multicast user logic grouping mechanism at a server end and a system processing flow of a client joining multicast service stream are the key content of the invention. The system has the advantages that: 1) the system is compatible with OMA DRM 2.0 and provides a solution of content protection for wide application of a mobile multicast stream media service in a third generation mobile communication system; 2) the system provides a multicast receiver logic grouping strategy, reduces bandwidth consumption for transmitting a plurality of secondarily-encrypted content keys and provides support for concurrent users; 3) the system adopts MD5 summary algorithm and the video watermark authentication technology to provide the data integrity and the accuracy verification in the multicast transmission process; and 4) the system embeds a removable watermark sequence into motion vectors of original video data, has low complexity of watermark related operations, and eliminates video quality reduction possibly caused by watermark embedding.

Description

technical field [0001] The invention relates to a mobile streaming digital rights management system for multicast services, mainly on the basis of being compatible with the DRM 2.0 standard formulated by OMA (Open Mobile Alliance), adopting mechanisms such as multi-layer encryption, video watermark authentication, logical grouping, etc., to provide Digital rights management functions for mobile multicast streaming media services. technical background [0002] Streaming media has the characteristics of downloading and playing at the same time, without the need for users to download complete media data, which significantly reduces the waiting time for users to play. Mobile streaming media services have become one of the most important value-added data services for mobile operators. As an important way to transmit streaming media data, multicast has the advantages of saving network bandwidth and can support thousands of users at a lower cost. It has become one of the main appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L29/06H04L12/18H04L12/56
Inventor 张宝贤高雪赵壮黄奎姚郑张锋
Owner 泛联智城(北京)国际科技有限公司
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