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

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...

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 content encryption key in the streaming media transmission process, there is a longer streaming media transmission time period. Internal keys may be cracked, content security is threatened, etc.

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