Digital content distributed authorization method

Abstract

The invention discloses a digital content distributed authorization method, which belongs to the technical field of digital copyright protection. The method comprises the following steps of: 1) calculating a re-encryption key for a content user by a server during registration; 2) acquiring an agency certificate from the server during the initialization of an authorized agent; and 3) re-encryptinga content key cipher text by the authorized agent with the re-encryption key of the content user during the authorization of the digital content so as to obtain a re-encrypted content key cipher textand establish a digital certificate according to the re-encrypted content key cipher text; and transmitting the agency certificate of the authorized agent per se and the established digital certificate to the content user by the authorized agent. Compared with the prior art, the method has the characteristics of safe and efficient authorization, balanced system overhead and strong extensibility, and expands the approaches for the user to acquire the certificate.

Description

technical field [0001] The invention belongs to the field of digital rights protection technology (Digital Rights Management, DRM), and relates to a digital content distributed authorization method. Background technique [0002] Today, when Internet users have a high level of autonomy and activity, every Internet user may be a creator and user of digital works. P2P file sharing system has become a shared platform among individual users due to its low cost, flexibility and high scalability. A vital avenue for digital content. However, due to the lack of copyright protection mechanism, a large amount of digital content in the P2P file sharing system is illegally disseminated and used, and the demand for introducing DRM function into the P2P file sharing system to protect digital copyright is increasingly strong. [0003] The most common DRM system at this stage includes three modules: content server, license server and security client. The main function of the content server...

AI Technical Summary

Problems solved by technology

In this method, the retrieval server needs to calculate and distribute the key in each authorization process, the calculation and storage costs are large, it is easy to become a system bottleneck, and there is a single point of failure problem, which does not maintain the original flexibility and security of the P2P file sharing system. Highly scalable

To realize distributed authorization of digital content in P2P file sharing system, the document "DRM Enabled P2P Architecture" (Jae-Youn Sung; Jeong-Yeon Jeong; Ki-Song Yoon, The 8th International Conference on Advanced Communication Technology, 2006, Volume 1 , Page(s): 487-490) proposed a distributed authorization model that does not require the participation of servers. License issuance rights can be transferred or copied between nodes through transactions, so that any node in the P2P network can issue licenses. But this scheme that allows arbitrary nodes to issue licenses without any effective control is unreliable

Malicious nodes can issue licenses in the network at will after obtaining license issuance rights, or copy license issuance rights without charging fees normally, resulting in out-of-control rights management

In the scheme proposed in the document "Integrated Copyright Protection in Peer-to-Peer Networks" (Xiaosong Lou; Kai Hwang; Runfang Zhou, The 27th International Conference on Distributed Computing Systems Workshops, 2007, Page(s): 28-28), P2P A group of trusted proxy nodes in the network are responsible for disseminating the plaintext of digital content to authorized users and preventing the plaintext of digital content from being transmitted to unauthorized users. However, this scheme can only protect the copyright of digital content within the P2P system, and cannot prevent users from purchasing digital content. The case where the digital content is published in plain text outside the P2P system

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