Content ciphered key exchange method for digital copyright management system
A content encryption key and digital copyright management technology, applied in the public key and key distribution of secure communication, can solve problems such as potential security risks, affecting the normal use of users, infringement of legitimate rights and interests, etc., to achieve easy replacement, protection of legitimate rights and interests, Unbreakable effect
Active Publication Date: 2013-04-03
SHANGHAI AISINOCHIP ELECTRONICS TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
This poses a great security risk. Once the CEK of the digital information product is cracked, the digital information product can be used once and for all.
For example, in online education, if a video tutorial is encrypted with a fixed CEK, once the CEK is cracked, the legitimate rights and interests of the CI providing the video tutorial will be violated
And if you want to replace the CEK, because some digital information products are played in real time or online, this will affect the normal use of users
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0034] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and all similar methods and similar changes of the present invention should be included in the protection scope of the present invention.
[0035] The present invention provides a CEK switching method, the core idea of which is RO pre-release and switching time window. RO pre-publishing means that before the CEK switching, the rights issuer (RI) releases the RO containing the CEK to the client terminal equipment to prepare for the CEK switching. Due to the deviation of the clocks of each device in the system, complete synchronization of the switching time cannot be achieved. Therefore, a switching time window is set to ensure that the client device can also use digital information products normally when the time of the client device is slightly different from the se...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A content encryption key switching method of a digital copyright management relates to the technical field of the digital copyright management, which aims to solve the technical problems of easy replacement and difficult declassification of CEK. The CEK switching method lies in the RO prerelease and a switching time window. The RO prerelease means that copyright issuers (RI) issue RO including CEK to a client terminal device before the CEK switching prepared for the switching of CEK. As the clocks of all devices of a system have deviation unable to realize the complete synchronization of switching time, and a switching time window is set for assuring the client terminal device to normally use digital information products under the condition of existing slight deviation between the time ofthe client terminal device and the time of a server. The switching time window comprises a front window and a back window, which is a unified parameter inside a system, and is uniformly allocated andmanaged by a middleware without easily changing. The CEK switching method of the invention has the characteristics of each replacement and difficult declassification.
Description
technical field [0001] The invention relates to the field of digital rights management (DRM), in particular to a method for switching content encryption keys (CEK) in the DRM system. Background technique [0002] In the DRM system, the digital information products provided by the content issuer (CI) are published on the network after being encrypted by CEK. In this way, the client device must obtain the corresponding CEK if it wants to use (including online playback, viewing, downloading, etc.) Restrictions on number of times, usage time, etc. In the DRM system, CEK is generally encrypted and combined with the use rights of digital information products to form a copyright object (RO). RO generally requires integrity protection. RO and encrypted digital information products generally arrive at the client device through two different paths, where the encrypted digital information product may arrive at the client device in the form of information flow or in the form of a file...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04L9/30
Inventor 周玉洁李飞
Owner SHANGHAI AISINOCHIP ELECTRONICS TECH