OMA DRM stream media rights management system based on multilayer encryption system

A technology of copyright management and multi-layer encryption, which is applied in transmission systems, digital transmission systems, electrical components, etc., and can solve problems such as content security threats and key cracking

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

The OMA DRM 2.0 specification briefly describes the application scenarios of streaming media. Similar to other streaming media copyright management solutions, due to the use of a unique cont

Method used

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  • OMA DRM stream media rights management system based on multilayer encryption system
  • OMA DRM stream media rights management system based on multilayer encryption system
  • OMA DRM stream media rights management system based on multilayer encryption system

Examples

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Embodiment Construction

[0028] 1) Server-side media data encryption and packaging process

[0029] The processing process of the data packaging server to the watermark embedding, the encryption of the media data and the PDCF packaging is (see attached figure 2 ):

[0030] ① A new 128-bit content key is generated every 20 seconds. Based on the content encryption layer 2 key specified by RI, the content key is encrypted with the 128-bit AES encryption algorithm to form a 128-bit secondary encrypted content key. (shown by arrow 1);

[0031] ②A digital digest algorithm (MD5 algorithm) is used to perform digest operation on the 128-bit secondary encrypted content key to form a digest of the 128-bit secondary encrypted key (shown by arrow 2);

[0032] ③ according to Figure 4 In the structure shown, a 136-bit watermark sequence structure is generated based on the digest of the 128-bit secondary encryption key, in which the 8-bit start identifier is 0xA7 (mainly used for synchronization of the start pos...

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Abstract

The invention relates to a mobile digital rights management system of a unicast stream media service, which adopts a multilayer encryption mechanism and video watermarking technology based on compatible OMA DRM 2.0 standard so as to enhance the content security of the mobile stream media service. Watermark embedding at a server end, encryption and PDCF packaging of media data and reverse processing of a client are the core content of the invention. The system has the advantages that: 1) the system adopts a two-layer time-varying content encryption mechanism and improves the security of content transmission; 2) the system is compatible with the OMA DRM 2.0 standard, is suitable for a mobile terminal and has low-cost proposal implementation; 3) the system adopts the watermarking technology to carry a digital summary of secondarily-encrypted content keys in original video data and supports the transmission integrity and accuracy verification of effective secondarily-encrypted keys or media data; and 4) the system embeds a removable watermark sequence into a susceptible and variable high-frequency I frame luminance component VLC domain, has low operation complexity of watermark embedding, extraction and removal, and eliminates video quality reduction possibly caused by the watermark embedding.

Description

technical field [0001] The invention relates to a mobile digital copyright management system for unicast streaming media services, mainly based on the DRM 2.0 standard formulated by OMA (Open Mobile Alliance), adopting a multi-layer encryption mechanism and simple video watermarking technology to enhance mobile streaming media Digital rights management system for business content security. technical background [0002] Streaming media is a new type of media service that emerged in the context of the rapid development of computer network / communication network and media information processing technology. It has the characteristics of downloading and playing at the same time. It does not require users to download the media data completely, which significantly reduces the user's waiting time and The storage space used. With the development of mobile communication technology and the enhancement of processing capabilities of smart handheld communication terminals, mobile streamin...

Claims

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Application Information

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IPC IPC(8): H04L9/18H04L29/06
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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