CN102945532A - Digital rights realizing method for supporting rights assignment - Google Patents

Abstract

The invention is a digital copyright realization method supporting copyright transfer, which is divided into a node client application and a node server application. The node client application refers to the DRM copyright transaction application of the user who intends to transfer their own media copyright and the node who intends to purchase the copyright. It can be embedded as a module in the DRM protection system of the client node. The node server-side application refers to the super nodes arranged by nodes with strong processing capabilities or streaming media copyright managers in the P2P network. The super nodes form a P2P network with each other and are responsible for the copyright transaction process of nodes in a certain area. The normal operation of the end node application requires the cooperation of the node copyright information database, which is mainly used to solve the demand for copyright information transactions between the media file owner and the copyright requester. Using the one-time proxy signature algorithm, not only can the problem file owner Bring economic benefits, but also provide rich media needs for media users.

Description

A Digital Copyright Realization Method Supporting Copyright Transfer

technical field

The invention is a solution for protecting the copyright of digital audio and video works in the network environment, especially relates to the digital copyright transfer problem in the DRM model in the peer-to-peer network environment, and belongs to the field of multimedia digital copyright protection.

Background technique

Digital Rights Management (DRM for short) refers to a technical tool for the protection and management of intellectual property rights in the process of production, dissemination, sales and use of digital content. Its specific application can include the protection of ebook, video, audio, e-book and other digital product content. It protects the rights and interests of owners and operators of digital information by authenticating users unforgeably, granting rights to users, and regulating user behavior in the digital space. The goal of DRM is to use technical means to curb piracy, protect the intellectual property rights of digital content, ensure the smooth flow of digital product market sales channels, protect the interests of authors, publishers, distributors and the legal use rights of users, so as to obtain the interests of all parties. Realize and balance, and promote the prosperity of the electronic publishing industry.

Digital signature refers to the encryption formed by using a hash function to form a fixed-length hash value for the data to be sent by the user in an asymmetric key encryption system, and then encrypting the hash value with its own private key. The text is called the user's data signature on the data corresponding to the hash value. Digital signature verification of information through the user's public key can ensure the non-repudiation and integrity of the information sent by the user, and is an important technical means to resolve disputes in the communication field. One-time digital signature technology is a new branch in the field of digital signature. It means that every time the signature scheme is run, a pair of signature keys must be regenerated, including signature public key and private key, and the signature key is only valid for A message is safe and effective, but the signed message can be verified infinitely many times. In layman's terms, the generation of the signature key pair of the one-time digital signature is related to the content of the message to be signed, so a pair of public keys can only be valid for this message for effective verification, and it cannot be valid for another message Signature and verification, so it is called one-time signature verification. On this basis, a one-time proxy signature algorithm is produced, which is a one-time signature algorithm with a proxy function added on the original basis. The so-called proxy function means that the original user can generate a one-time proxy key for the specified user, and the user can Use this key to perform a signature operation on the media content, and this signature can be verified by the original user's key, just like the signature made by the proxy's own key, so it is a one-time proxy signature key. The generation of one-time proxy signature key provides an effective theoretical basis for the transfer of copyright in DRM.

The current DRM system generally adopts the method of encrypting media files, and the user can decrypt and play the media files after obtaining the playback authority of the files. However, with the development of the multimedia market and the diversification of user needs, people hope to transfer the ownership of digital products. For example, a user has obtained the right to play multimedia files, but loses the sense of freshness after enjoying the media content, and at the same time has a demand for other media file content, so if the copyright of the existing media can be transferred and The income obtained can be used to obtain the right to use other unappreciated media, which not only saves expenses, but also increases the practicality and flexibility of the DRM system. The present invention is exactly a kind of solution that produces for solving this demand.

Contents of the invention

Technical problem : the technical problem to be solved by the present invention is to provide a digital

The copyright implementation model solves the problem of media copyright transfer in the peer-to-peer network environment by introducing a one-time key encryption mechanism. It is mainly used for the media file owner's transfer of media copyright in the DRM system.

Technical solution: The method of the present invention is a strategic method. By introducing a one-time key encryption mechanism, the problem of media copyright transfer in a peer-to-peer network environment is solved, specifically through the following solutions:

1. Architecture

The implementation of this solution is mainly divided into two parts: node client application and node server application. The node client application refers to the DRM copyright transaction application of the user who intends to transfer their own media copyright and the node who intends to purchase the copyright. It can be embedded as a module in the DRM protection system of the client node. The node server-side application refers to the super nodes arranged by nodes with strong processing capabilities or streaming media copyright managers in the P2P network. The super nodes form a P2P network with each other and are responsible for the copyright transaction process of nodes in a certain area. The normal operation of the end node application requires the cooperation of the node copyright information database. The application of each part is introduced in detail below:

The DRM copyright transaction module of the copyright transfer node : responsible for confirming the certification of the copyright ownership of the digital media content to the copyright transaction server end node.

The DRM copyright transaction module of the copyright purchase node : responsible for sending a copyright transaction request to the node, making transaction payment and receiving copyright ownership.

Copyright transaction node server-side copyright transaction module : responsible for processing the copyright verification request, and updating the copyright transaction database information after the copyright transfer transaction is completed.

2. Method flow

The main workflow of the system is as follows:

Step 1: The original owner of the media file first registers its ownership of the media file with the copyright transfer server node, and the registration request message sent should include the description information of the registered media file, the node ID, and the node’s information about the media file. Ownership credential information of the media file, where the node’s ownership credential file for the media file is obtained by signing the hash value of the original content of the media file and the node identification information with the original owner’s private key. After receiving the registration request information, the server node verifies the user's signature and confirms that the node information and media description information are consistent with the information in the ownership signature, and then puts all the information into the media copyright information database;

Step 2: Request the copyright node to send a copyright transfer request message containing the required media file to the server node. If the server node queries the copyright information database for the information of the media file requested by the user, the service node returns the node containing the requested media owner Address linked list, requesting nodes to negotiate copyright transfer with media file owners;

Step 3: If the negotiation is passed, the media file requester sends the node information to the copyright owner node, and then the copyright owner node first authenticates the ownership to the server node. If the authentication is passed, continue to step 4, otherwise the copyright transaction is terminated ;

Step 4: The media file owner node runs the one-time proxy signature key algorithm to generate the copyright certificate of the media file for the user who purchases the copyright, and then sends it to the server node;

Step 5: After the copyright purchase node makes copyright payment through the third-party payment platform, the server node sends the media copyright certificate file to the purchase node;

Step 6: The purchase node needs to go to the server node to authenticate the copyright certificate file when playing the media file for the first time, and the entire copyright transaction process is over.

Beneficial effects: the method of the present invention proposes a multimedia data copyright transfer scheme, which is mainly used in the media file owner's transfer operation of media copyright in the DRM system. Below we give specific instructions.

1. safety

Since the information of the owner of the media file is stored on the server node, only the original owner of the media file has the right to transfer the media copyright. Although other nodes own the media credential file through purchase and can pass the authentication of the server node, because the license contains the identification information of the purchase node, the copyright cannot be transferred again, thus effectively protecting the interests of the original owner of the media file .

2. flexibility

Since this system uses a one-time proxy signature algorithm, the owner of the media file can not only issue copyright certificates to the users of the server node to which he belongs, but also issue a one-time proxy signature key to other server nodes, so that other server nodes can act as their own proxy Issuing copyright certificates not only reduces its own burden but also improves the flexible application of the system.

3. Economy

Since there is only one original owner of the media file, the original user can only transfer the copyright of the media file instead of the ownership of the file. The copyright of the so-called media files refers to the right to download and enjoy the media files, but does not include the right to make further profits from the media files. At the same time, since the copyright only gives the user the right to use it, the user can obtain it at a relatively low cost, and at the same time expand the promotion scope of the application, thereby improving economic benefits.

Description of drawings

Figure 1 is the overall architecture diagram of the system. the

Figure 2 is the overall flow chart of the system work.

Detailed ways

For the convenience of description, we assume the following application examples of the digital rights transfer system:

Assume that user Alice wishes to obtain the playback copyright of multimedia video files through this system, and Bob is the original owner of the media files. The specific implementation method is as follows:

Step 1: Alice first runs the DRM key acquisition module to obtain a pair of RSA asymmetric key pairs, and then registers her own ownership information with the server node. The registration request includes the node identification PID, media file description information, and her own media file information. Proof of ownership file. Among them, the node's ownership certificate file for the media file is obtained by signing the hash value of the original content of the media file and the node identification information with the private key of the original file owner, and then encrypting the ownership information with the public key of the server-side node. Send it to the server-side node together with the registration request information. After receiving the registration request information, the server-side node verifies the user signature and determines whether the node information and media description information are consistent with the corresponding information in the ownership signature. If they are consistent, all information will be Put into the media copyright information database.

Step 2: Request the copyright node to send a copyright transfer request message containing the required media file to the server node. If the server node queries the copyright information database for the information of the media file requested by the user, the service node returns the node containing the requested media owner Address linked list, the requesting node can negotiate copyright transfer with the media file owner.

Step 3: After the negotiation is passed, the Alice node obtains the PID of the requesting node identification information, and combines the media content information and the Bob node PID to generate a corresponding HASH value. Then run the one-time proxy signature key algorithm to obtain a proxy signature key pair, use the one-time proxy signature key pair to sign the HASH value, generate the ownership certificate operation, and send it to the server node.

Step 4: After receiving the certificate, the server node notifies the Bob node to perform the payment operation, and Bob pays for the copyright ownership through the third-party payment platform.

Step 5: After receiving the payment notification, the server node sends the media file copyright certificate to the Bob node.

Step 6: Obtaining the copyright node needs to go to the server node to authenticate the copyright before playing the media file for the first time. If the node information is consistent with the node information in the copyright certificate, the authentication will pass. Otherwise, the node will be blacklisted and its copyright license will be revoked Permissions, the transaction process ends.

Claims (1)

1. A digital copyright implementation method that supports copyright transfer, is characterized in that the steps included in the method are: Step 1: The original owner of the media file first registers its ownership of the media file with the copyright transfer server node, and the registration request message sent should include the description information of the registered media file, the node ID, and the node’s information about the media file. Ownership credential information of the media file, where the node’s ownership credential file for the media file is obtained by signing the hash value of the original content of the media file and the node identification information with the original owner’s private key. After receiving the registration request information, the server node verifies the user's signature and confirms that the node information and media description information are consistent with the information in the ownership signature, and then puts all the information into the media copyright information database; Step 2: Request the copyright node to send a copyright transfer request message containing the required media file to the server node. If the server node queries the copyright information database for the information of the media file requested by the user, the service node returns the node containing the requested media owner Address linked list, requesting nodes to negotiate copyright transfer with media file owners; Step 3: If the negotiation is passed, the media file requester sends the node information to the copyright owner node, and then the copyright owner node first authenticates the ownership to the server node. If the authentication is passed, continue to step 4, otherwise the copyright transaction is terminated ; Step 4: The media file owner node runs the one-time proxy signature key algorithm to generate the copyright certificate of the media file for the user who purchases the copyright, and then sends it to the server node; Step 5: After the copyright purchase node makes copyright payment through the third-party payment platform, the server node sends the media copyright certificate file to the purchase node; Step 6: The purchase node needs to go to the server node to authenticate the copyright certificate file when playing the media file for the first time, and the entire copyright transaction process is over.

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