新型通用格式多媒体数字版权管理系统设计与实现

doi:10.3969/j.issn.1000-436x.2013.10.018

摘要/Abstract

摘要：

针对多媒体内容的版权保护问题，设计一种新型通用格式多媒体数字版权管理模型，包括内容加密与打包、密钥管理、安全引擎、许可证管理与分发、DRM客户端和DRM管理等功能单元，该模型通过非结构化加密方法，克服了基于内容格式加密方法的局限性，实现对通用格式多媒体内容的保护。另外，采用许可证提取码作为下载许可证的凭证，解决许可证重新发行和转让的问题，并支持细粒度使用控制方式。基于此模型，实现了基于固定与移动融合业务的多媒体数字版权管理系统，并将其运用于数字消费领域，实验结果和实际运行表明该方案不影响多媒体质量，效率及安全性较高，在多媒体内容版权保护方面具有较好的实用性。

关键词: 数字版权管理, 多媒体版权保护, 非结构化加密, 许可证书, 使用控制

Abstract:

Aiming at the copyright protection of multimedia content,a novel general format multimedia digital rights management model was designed which includes encryption and packaging of content,ke nagement,security engine,license management and distribution,DRM client,DRM management and other functional units.This model uses un-structured encryption method which overcomes the limit ions of encryption method based on the content format to sup-port the general format multimedia.In addition,this model uses the license acquisition number as the only certificate to download license to solve the problem of license reissue and transfer,and supports fine-grained control model.Combined with this model,a multimedia digital rights management system was developed based on fixed and mobile converged services which is used in the field of digital consumer.experimental results and practical application show that this scheme with good practice in the copyright protection multimedia content does not affect the multimedia quality,and have high efficiency and safety.

Key words: digital rights management, multimedia rights management, unstructured encryption, license, usage control

黄勤龙,马兆丰,莫佳,钮心忻,杨义先. 新型通用格式多媒体数字版权管理系统设计与实现[J]. 通信学报, 2013, 34(10): 153-161.

Qin-long HUANG,Zhao-feng MA,Jia MO,Xin-xin NIU,Yi-xian YANG. Design and implementation of a novel general format multimedia digital rights management system[J]. Journal on Communications, 2013, 34(10): 153-161.

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参数名称	含义
CP	content provider
CID	content identity
PCD	plain content data
ECD	encrypted content data
ECH	encrypted content hash
DCD	DRM content data
CPK	content provider key
CRK	content random key
CEK	content encryption key
AID	algorithm identity
RID	retrieval identity

参数名称	含义
MK	master key
EPK	encrypted provider key
UEK	user encryption key
PRK	private key
PUK	public key

参数名称	含义
UID	user identity
DID	device identity
REX	rights expression
LCQ	license request
LQS	license request signature
LCC	license content
LCS	license signature
LIC	license

元素	描述
count	计次元素规定一个许可对DRM 内容可授权使用的次数
timed-count	定时计次元素可视为增加了一个可选择的定时器属性的计次元素
datetime	日期时间元素定义时间的范围，对包含的许可分别表示时间的限制
start	开始元素规定开始的时间或日期
end	结束元素规定结束的时间或日期
interval	间隔时间元素规定许可能够在DRM 内容上执行的时间周期
accumulated	累计时间元素规定权利作用于DRM 内容的累计时间的最大值
individual	个体元素规定与DRM内容所绑定的个体
system	系统元素规定DRM 内容和权利对象可以输出到的目标系统

内容分辨率	内容大小/MB	加密时间/s		加密速度/(Mbit·s^{- 1})
内容分辨率	内容大小/MB	本文	文献[9]	本文	文献[9]
320 p	109	11.0	12.6	9.91	8.65
480 p	157	15.9	18.2	9.87	8.63
720 p	321	32.2	38.3	9.97	8.38
1 080 p	648	63.9	80.5	10.14	8.05