CN111625779B - Block chain-based social network digital content copyright protection method - Google Patents
Block chain-based social network digital content copyright protection method Download PDFInfo
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Abstract
A block chain-based social network digital content copyright protection method comprises a system environment construction part and a copyright protection implementation part, wherein the system environment construction part is used for establishing a block chain-based social network digital content protection system framework, a user registers an account number in a social platform, an API calls an intelligent contract through an SDK to apply for a certificate from an intermediate CA and return the certificate, the user verifies, processes and returns digital copyright content when issuing, forwarding and inquiring, a block chain technology is adopted to completely upload (affirm), issue (use), forward (propagate) and inquire the corresponding digital work of the user, propagation path tracks in the life cycle of the whole copyright information are recorded in detail, powerful support is provided for copyright information verification and source tracing, and the propagation mechanism can improve the safety of the copyright information in a social network.
Description
Technical Field
The invention belongs to the technical field of internet, and particularly relates to a block chain-based social network digital content copyright protection method.
Background
With the development of internet technology, more and more digital creative works are introduced into the lives of people, users and digital contents on a multimedia social network are increased explosively, in such a large amount of digital resources, how to protect the copyright of the creative digital works issued by the users in the social network and maintain the co-issue rights of creators against infringement is a serious challenge for solving the infringement problem of the digital works in the current social network.
At present, the solution to the infringement problem of digital works is mainly realized by a digital copyright management technology. Digital rights management technology is a technology directed to protecting multimedia content from unauthorized use and dissemination in an internet environment. The digital rights management system can be divided into a digital rights management system based on an encryption authorization technology and a digital rights management system based on a digital watermarking technology according to different used security mechanisms. The digital copyright management system based on the encryption and authorization technology means that a publisher protects digital works through an encryption means, and a user can only use the digital copyright management system normally after decrypting and authorizing an encrypted file through a purchased key. The digital copyright management system based on the digital watermarking technology hides copyright information in a work by using the watermarking technology under the condition of not influencing the use quality of the digital work, and can detect the copyright information of the work only through a specific mode, thereby achieving the purposes of copyright identification, propagation process tracking and the like.
Each large IT grandhead also launches ITs own unique product and digital rights management system, such as Microsoft's PlayReady DRM, orthodox Apabi, etc. Most of these digital rights management schemes prevent digital copyrighted contents from being illegally stolen and copied by means of digital watermarking techniques, cryptography techniques or a combination of both. The original intention of the digital copyright management technology is to ensure that the copyright content can be legally used and spread through a technical means, and the normal spread and popularization of high-quality digital works are influenced along with the excessive use of the DRM technology, which is contrary to the original intention. Therefore, the digital copyright management system should do the right-confirming work when the digital works are registered, and when the infringement event occurs, the system provides strong evidences such as copyright certification and the like, and the system is the most effective way for correctly solving the infringement problem by assisting the creators to maintain the own legal benefits through legal means.
Disclosure of Invention
In order to solve the technical problems, the invention provides a block chain-based social network digital content copyright protection method, which adopts a block chain technology to completely upload (confirm right), release (use right), forward (spread) and query corresponding digital works of a user, records the propagation path track in the life cycle of the whole copyright information in detail, provides powerful support for copyright information verification and traceability, and can improve the safety of the copyright information in a social network.
In order to realize the technical purpose, the adopted technical scheme is as follows: a social network digital content copyright protection method based on a block chain comprises a system environment construction part and a copyright protection implementation part;
step 1, system environment construction
Building a system environment, and building a social network digital content protection system framework based on a block chain, wherein the framework comprises a block chain system and a social platform, and the block chain system comprises: a data layer, a network layer, a fusion layer, a consensus layer, a contract layer and an application layer;
step 101, deploying a P2P network environment for providing a necessary network foundation for communication of each node based on a network layer;
102, constructing a root CA and issuing an authorized intermediate CA as a platform automatic authentication and authorization node;
103, defining a double-chain structure of a copyright information chain and an information transmission chain in a data layer, and configuring an encryption mode of encrypted data;
step 104, configuring a consensus strategy based on a consensus layer, and ensuring that data in all nodes in the P2P network are completely the same and reach distributed consistency;
step 105, establishing a fusion mechanism based on a fusion layer, preprocessing copyright information in a copyright information chain and propagation information of an information propagation chain by taking a Hash value as a medium, and combining digital copyright content with the copyright information and the propagation information, so that information resources can be conveniently interconnected and intercommunicated;
step 106, compiling an intelligent contract and installing, wherein the contract can be automatically called to process and return data during data access;
step 107, generating a created block by allocating the size of a single block and the time interval of block generation, and initializing a block chain system by the created block;
step 108, issuing the SDK based on the block chain system, and providing an entrance for calling a social platform;
step 109, the social platform issues an API according to the SDK provided by the blockchain system, and the data interaction between the social platform and the blockchain system is opened;
step 2, implementing copyright protection
A user registers an account number in a social platform, an API calls an intelligent contract through an SDK to apply for a certificate from an intermediate CA and return the certificate, and the user verifies, processes and returns digital copyright content when issuing, forwarding and inquiring;
A. user publishing dynamic and uploading digital rights content
Step A201, the API sends the newly uploaded digital copyright content to a block chain system through the SDK;
step A202, a block chain system receives digital copyright content and triggers a detected intelligent contract, the detected intelligent contract verifies a user certificate, if the certificate is illegal, the state and the reason of failure of certificate verification are directly returned to an API, if the certificate is legal, hash operation is carried out on the digital copyright content and the digital copyright content is sent to a fusion layer, a copyright information chain is accessed to detect whether the digital copyright content exists, if the digital copyright content exists, the existing state is returned to the API, the API returns the existing information of the digital copyright content to a terminal user, if the digital copyright content does not exist, the intelligent contract which is responsible for storing the digital copyright content is called to store the digital copyright content and return a Hash address after adding a digital watermark, after the intelligent contract which is responsible for storing the copyright information receives the Hash address, the copyright information is written into an account book of the copyright information chain, after accounting is finished, the whole network broadcasting is carried out through a consensus strategy, when the data in the copyright information chain is synchronously finished among all nodes, the intelligent contract which stores the transmission information after the transmission of the transmission information is carried out, the account book is calculated, the degree and authority are calculated, and the influence of the calculated in the relation of the content is recorded in the whole network, and the account book which is broadcast;
step A203, if the synchronization of the broadcast message in the block chain system fails, recording the abnormal message occurring during the synchronization in an error log of the block chain system, and returning the failure state to the API, if the synchronization of the broadcast message in the block chain system succeeds, returning the operation success message and the Hash address by the block chain system, storing the received Hash address and the dynamic information filled when the user issues the dynamic state by the API, and returning the success message to the user;
B. user browses other people information and forwards operation
Step B201, the API calls the intelligent contract to send to the fusion layer by sending the acquired user information and the forwarded digital copyright content to the SDK, the fusion layer retrieves the copyright information of the original work in a copyright information chain through a work Hash address, then calls the intelligent contract for storing the transmission information, calculates the association degree and authority degree through a process scheduling algorithm, calculates the dynamic influence at the moment, records the calculated influence, the currently logged user information, the original publisher information of the digital copyright content and the forwarded user information in an account book of the information transmission chain, and broadcasts the whole network after the completion;
step B202, if the synchronization of the broadcast messages in the block chain system fails, recording abnormal messages occurring during the synchronization in an error log of the block chain system, and returning a failure state to the API, if the synchronization of the broadcast messages in the block chain system succeeds, returning an operation success message and a Hash address by the block chain system, storing the received Hash address and dynamic information filled when a user forwards the dynamic information by the API, and returning the success message to the user;
C. user query for digital rights content
Step C301, when a user inquires digital copyright content information through a social platform, an API calls an SDK and triggers a detected intelligent contract, after certificate verification succeeds, the intelligent contract is accessed and an inquiry instruction is sent to a fusion layer, the fusion layer analyzes the inquiry instruction and sends the inquiry instruction to a main node of a copyright information chain and a main node of the transmission information chain respectively, the transmission information chain retrieves the transmission information after receiving the inquiry instruction, the retrieved transmission information is packaged and sent to a common node of the transmission information chain and the copyright information chain and then sent to the main node of the copyright information chain by the common node, the copyright information chain also packages the copyright information and sends the copyright information to the main node at the moment, after the main node receives and verifies the integrity of the copyright information package and the transmission information package, the fusion layer decodes data packages of the copyright information and the transmission information respectively, and splices the decoded copyright information and the transmission information according to a specified data format, after splicing, the packaged data is returned to the API, and is displayed to a user terminal.
The influence of the user consists of two parts of relevancy and authority, and the calculation formulas of the relevancy and the authority are as follows:
in the formula (1) and the formula (2), U represents a set in the user group, k represents a constant in the range of the set U, and U represents k Is a dynamic publisher, T is a user U k+1 Selected type of propagation, CT t (U k+1 ,U k T) is the user U at time step T k And user U k+1 Regarding dynamic cumulative total of review traffic, AT t (U k+1 ,U k T) is the user U at time step T k And user U k+1 The dynamic forwarded accumulated total number and the delta variable are interference parameters, and the influence is obtained by weighting the association degree and the authority degree in a lambda mode, as shown in a formula (3);
Influence:P I [U k ]＝λP Correlation [U k ]+(1-λ)P Authority [U k ] (3)。
the invention has the beneficial effects that: the technical scheme of the invention protects the storage safety of digital media copyright information by using the block chain type structural characteristic, records the release and propagation track of digital copyright content, realizes data fusion between double chains by using a common node as a communication medium mode, ensures that the safety of copyright data is reliably and effectively ensured in the social network propagation process, provides copyright protection for the digital copyright content of users in the social network, and maintains the legal rights and interests of creators without being infringed. The propagation mode and the track of the digital works in the multimedia social network are completely recorded through the block chain technology, so that copyright certification and a complete evidence chain can be provided for the creator, and the creator is better assisted to maintain the own legal rights and interests.
Drawings
FIG. 1 is a system framework diagram of the present invention;
FIG. 2 is an architecture diagram of the blockchain system of the present invention;
FIG. 3 is a diagram of role function classification of each node in the P2P network according to the present invention;
FIG. 4 is a data communication diagram between a broadcast chain and a copyright chain according to the present invention;
FIG. 5 is a diagram of the propagation debugging process of the present invention.
Detailed Description
In the multimedia social network, a user can publish some dynamic information (friend circles, microblogs, spaces and the like) in a social platform, and part of the dynamic information contains digital copyright content (pictures, videos and the like). The digital copyright contents containing copyright information are seen by other users and embezzled, and self-owned by the identity of the original author and earn interests, thereby causing the interests of the real author to be damaged. Therefore, the invention utilizes the block chain technology to carry out the following improvement on the social platform, so that certain safety guarantee is provided for the copyright information of the user on the basis of not influencing the social function of the user.
The invention expands the existing block chain system, supplements and perfects modules related to copyright protection in the social network, leads digital copyright content to have corresponding records from uploading, publishing, forwarding and inquiring, records the propagation path track in the life cycle of the whole copyright information in detail, forms a complete copyright content circulation chain, provides powerful support for copyright verification and traceability of the digital copyright content, supports the digital copyright content protected by the digital copyright to be transmitted in a correct form in the propagation process of the social network, and provides guarantee for the safety of the copyright information by adopting the technologies of digital watermarking, digital certificates and the like.
A block chain-based social network digital content copyright protection method comprises a system environment construction part and a copyright protection implementation part;
system environment construction
Building a system environment, and building a social network digital content protection system frame based on a block chain, wherein the frame comprises a block chain system and a social platform, and the block chain system comprises: data layer, network layer, fusion layer, consensus layer, contract layer, and application layer.
Step 1: and based on a network layer, a P2P network environment is deployed, and necessary network foundation is provided for communication of each node.
Step 2: and constructing a root CA, and issuing an authorized intermediate CA as a platform automatic authentication and authorization node.
And 3, step 3: and a double-chain structure of a copyright information chain and an information transmission chain is defined in a data layer, and an encryption data encryption mode is configured to provide security support for data storage.
And 4, step 4: and configuring a consensus strategy based on the consensus layer, and ensuring that data in all nodes in the P2P network are completely the same and achieve distributed consistency.
And 5: and establishing a fusion mechanism based on the fusion layer, preprocessing copyright information in the copyright information chain and the propagation information of the information propagation chain by taking the Hash value as a medium, and combining the digital copyright content with the copyright information and the propagation information, so that information resources can be conveniently interconnected and intercommunicated.
And 6: intelligent contracts are compiled and installed, and the contracts can be automatically called to process and transmit back data when the data are accessed.
And 7: generating a created block by configuring information such as the size of a single block, the time interval of the block generation and the like, and initializing a block chain system by using the created block.
And step 8: and issuing the SDK based on the block chain system, and providing an entrance for calling the social platform.
And step 9: and the social platform issues an API according to the SDK provided by the blockchain system, and gets through the data interaction between the social platform and the blockchain system.
(II) enforcing copyright protection
A. User publishing dynamic and uploading digital rights content
Step 1: and a certain user registers an account number in the social platform, and the API calls an intelligent contract through the SDK to apply for a certificate from the intermediate CA and return the certificate.
Step 2: and the user issues dynamic and uploads the digital copyright content, and the API sends the digital copyright content to the block chain system through the SDK.
And step 3: the block chain system receives the digital copyright content and triggers a detected intelligent contract, the detected intelligent contract verifies a user certificate, if the certificate is illegal, the state and the reason of failure of certificate verification are directly returned to an API, if the certificate is legal, hash operation is carried out on the digital copyright content and the digital copyright content is sent to a fusion layer, a copyright information chain is accessed to detect whether the digital copyright content exists, if the digital copyright content exists, the existing state is returned to the API, the API returns the existing information of the digital copyright content to a terminal user, if the digital copyright content does not exist, the intelligent contract which is responsible for storing the digital copyright content is called to store the digital copyright content and return a Hash address after adding a digital watermark, the intelligent contract which is responsible for storing the copyright information writes the copyright information into an account book of the copyright information chain after receiving the Hash address, and after the copyright information is completely stored, the intelligent contract broadcasts the whole network through a consensus strategy. When data in the copyright information chain is synchronously completed among all nodes, an intelligent contract for storing the spreading information is called, the association degree and the authority degree are calculated through a formula (1) and a formula (2) in an improved process scheduling algorithm, the dynamic influence at the moment is calculated through a formula (3), the calculated influence and information such as a digital copyright information publisher, a currently logged-in user, a Hash address and the like are recorded in an account book of the spreading information chain, and then, after accounting is completed, whole-network broadcasting is performed again.
And 4, step 4: if the synchronization of the broadcast messages in the blockchain system fails, the abnormal messages occurring during the synchronization are recorded in an error log of the blockchain system, and the failure state is returned to the API. If the broadcast message in the block chain system is synchronized successfully, the block chain system returns the operation success message and the Hash address, the API stores the received Hash address and dynamic information filled when the user issues the dynamic state, and the success message is returned to the user.
B. The user browses the information of others and forwards the information
Step 1: the API calls an intelligent contract to be sent to a fusion layer by sending the acquired user information and the forwarded digital copyright content to the SDK, the fusion layer retrieves the copyright information of the original work in a copyright information chain through a work Hash address and then calls an intelligent contract for storing the propagation information, the association degree and the authority degree are calculated through a formula (1) and a formula (2) in an improved process scheduling algorithm, the dynamic influence at the moment is calculated through a formula (3), and the calculated influence, the currently logged-in user, the original publisher of the digital copyright content and the forwarded user are recorded in an account book of the information propagation chain and broadcast to the whole network after the completion.
Step 2: if the synchronization of the broadcast messages in the blockchain system fails, abnormal messages occurring during synchronization are recorded in an error log of the blockchain system, and the failure state is returned to the API. If the broadcast message in the block chain system is synchronized successfully, returning the operation success message and the Hash address, storing the received Hash address and dynamic information filled when the user forwards the message dynamically by the API, and returning the success message to the user.
C. User query for digital rights content
When a user inquires digital copyright content information through a social platform, an API calls an SDK and triggers a detected intelligent contract, after certificate verification succeeds, the intelligent contract is accessed and an inquiry instruction is sent to a fusion layer, a fusion layer analysis instruction is respectively sent to a copyright information chain and a main node of the transmission information chain, the transmission information chain retrieves the transmission information after receiving the instruction, the retrieved transmission information is packaged and sent to a common node of the transmission information chain and the copyright information chain, the common node sends the transmission information to the main node of the copyright information chain, the copyright information chain also packages the copyright information and sends the transmission information to the main node, after the main node receives and verifies the integrity of the copyright information package and the transmission information package, the transmission information and the transmission information package are sent to the fusion layer together, the fusion layer decodes the data packages of the copyright information and the transmission information respectively, and splices the decoded copyright information and the transmission information according to a specified data format (namely, the copyright information is taken as a main body, a transmission information abstract is extracted and spliced as sub-information), after splicing, the parsed data is returned to the API and displayed to the user terminal.
As shown in fig. 1, the social platform needs to publish a series of APIs (application program interfaces) to process user data, blockchain data, and certificate data. And the user accesses the social platform from the terminal equipment and calls the API to perform operations such as certificate application, uploading of digital copyright content, inquiry of copyright information and the like. The API is used as a middleware to perform operations such as application and receiving of certificates, data transfer, request sending, and receiving and forwarding of returned data according to a strategy customized by the social platform. The middle CA (middle certification center) is issued by the root CA (root certification center) and provides necessary certificate support for the normal operation of the whole system. The blockchain system packages the read and store functions and then provides an SDK (software development kit) as the only entry for external data interaction. The SDK operates on the blockchain system by sending instructions or invoking intelligent contracts.
(3) Adding a fusion layer and a double-chain structure in a block chain system and a communication mechanism thereof
In a block chain system, a data layer stores data in a chain structure which is subjected to Hash operation and then is sorted according to a time sequence, and the security of the data is protected by adopting an asymmetric encryption technology. In this patent, the data layer needs to store two chain structure data, which are the copyright information chain and the broadcast information chain. The copyright information chain is used for storing copyright information of the digital copyright content, namely related copyright information (such as an uploader, a copyright person, registration time and the like) of the digital copyright content received by the blockchain system from the social platform and copyright information (such as a Hash value, a file size and the like) extracted from the digital copyright content by the blockchain system. The distribution information chain is used for storing the distribution information (such as dynamic publishers, dynamic forwarders, etc.) generated when the digital copyright content is distributed. The network layer provides a credible P2P network environment for the blockchain system, and each node in the network environment can directly communicate without being transferred through other nodes. The consensus layer synchronizes data in each node through a consensus strategy, so that each node meets the requirement of distributed consistency in the P2P network environment. The contract layer can automatically execute the intelligent contract, the written intelligent contract is issued to the contract layer, and once a trigger condition of a certain intelligent contract is reached, the intelligent contract is automatically executed. The application layer integrates the function modules by using the SDK according to needs by the social platform, so that the purpose of indirectly using the corresponding functions of the block chain system is achieved.
The social platform will store the received digital rights content in the P2P network with strict access restrictions, which will be used for copyright protection handling and certification. The social contact platform adopts a block chain technology to protect the safety of digital copyright content, and introduces a concept of a fusion layer in order to more conveniently and efficiently manage the interaction of copyright information and social network propagation information. The fusion layer is a data preprocessing layer of copyright information and transmission information, and combines digital copyright content with the copyright information and the transmission information by taking a Hash value as a medium, so that information resources can be conveniently interconnected and intercommunicated, and a stable and reliable access basis is provided for an upper layer structure to access the digital information. The copyright information chain and the propagation information chain of the data layer respectively store the copyright information and the propagation information of the social platform, the network layer provides a necessary communication basis, the fusion and the preprocessing of the copyright information, the propagation information and the digital copyright content (respectively decoding the data packets of the copyright information and the propagation information and splicing the decoded copyright information and the propagation information according to a specified data format) are completed in the fusion layer, each node meets the requirement of distributed consistency according to a strategy provided in the consensus layer, the data is secondarily processed and filtered through the contract layer, the data is summarized and uniformly displayed by the application layer, and the architecture model of the data is shown in fig. 2.
When digital copyright content needs to be stored, data enters a block chain from an application layer inlet through an SDK, a contract layer automatically executes a storage contract, the data is synchronized with other nodes in a network through a consensus strategy, and a fusion layer splits the data into copyright information and transmission information and stores the copyright information and the transmission information in a data layer in a chain structure respectively.
In the P2P network, due to the different roles of each node, the Org, the Orderer and the Peer are distinguished, each Org has at least one Orderer node and a plurality of Peer nodes, and the ordering and block-out service in the current Org is provided by the Orderer node. The Peer node is an essential component of the P2P network, and besides serving as a conventional accounting node (commit), it can also be endowed with special functions such as an enrerer, a Leader, and an Anchor. In order to ensure the secure transmission of data of each node, the TLS protocol is used as the underlying foundation, as shown in fig. 3.
When data of digital copyright content enters a P2P network, the data can be transmitted among nodes, and after verification, the data is written into a local account book, and the data communication scheduling process is as follows:
step 1: when data enters a P2P network, the data is assigned to a random Endorser node according to an endorsement strategy, the node performs endorsement operation, data information is encrypted and encapsulated into a transaction after the endorsement is completed, and the encapsulated transaction is sent to an Orderer node to which the node belongs.
Step 2: and the Orderer node sequences the received transactions in a time sequence, counts the received transaction data, packs all current transactions and generates a new block when the number of the transactions meets a block strategy. If the number of the transactions is insufficient, and the time interval according to the last block output reaches a specified threshold, all the current transactions are packed and output in a block mode.
And step 3: and the Leader node receives and verifies the block generated by the Orderer node, and writes the block into a local account book and updates the state database when verification is not wrong.
And 4, step 4: it is detected whether there are other orgs in the current link. If a plurality of orgs exist in the link, the current Org selects three Anchor nodes adjacent to the Org randomly for data propagation according to the Gossip protocol, and then the anchors broadcast in the respective orgs to update the data in the local account book.
And 5: and detecting whether an Org which is not propagated exists in the current link, and if so, performing propagation again until all the orgs in the current link synchronize the data.
The block chain adopts a double-chain structure composed of a propagation information chain and a copyright information chain, as shown in fig. 4, a node 1 and a node 2 are respectively the main nodes of the propagation information chain and the copyright information chain, and a node 3 is the common node of the propagation information chain and the copyright information chain. When the fusion layer requests digital copyright content data, the transmission information chain transmits the encrypted data of the transmission information to the node 3 when receiving the request, and transfers the encrypted data to the node 2 through the node 3, at the moment, the copyright chain also transmits the copyright information to the node 2, and finally, the node 2 packages and transmits the copyright information to the fusion layer for data fusion.
In a conventional state, the transmission information and the copyright information are stored by respective chains, the public node is in a dormant state, when the inquiry state is activated, the public node is activated, the copyright information chain is used as a main chain to receive data information submitted by the public node after the transmission information chain is packaged, the copyright information is packaged by the main node and then packaged, and finally the packaged information is transmitted to the fusion layer. Since the public node only has the transfer authority in the spreading information chain and only submits the authority to the main node in the copyright information chain, the data is still in a trusted environment through the shared nodes.
(4) Propagation process scheduling algorithm for improving social network
In a traditional social network model, only the propagation direction of information is modeled and analyzed, and then the propagation direction of the next step is predicted. In the invention, a scheduling algorithm of the block chain-based social network digital content copyright protection method is provided, so that more parameters can be recorded in the information transmission process, and necessary basic support is provided for future analysis and prediction. In the process of spreading, spreading information and copyright information of user works are stored in a data layer of a block chain system, and all the spreading path information and parameters of digital copyright contents from the beginning of entering a chain are completely recorded by utilizing the characteristic that the block chain technology cannot be tampered.
In the dynamic spreading process containing copyright information, interaction between participants and audiences is increased by means of dynamic comments or responses. It is defined that if two interacting parties belong to the same role, they are divided into the same group, and vice versa. After the user publishes the trends, the influence value of the user is calculated according to the browsing volume and the number of comments which publish the trends in the dynamic set list of the user. The influence of the user consists of two parts of association (Correlation) and Authority (Authority), and the calculation formula of the association (Correlation) and the Authority (Authority) is as follows:
in the formula (1) and the formula (2), U represents a set in the user group, k represents a constant in the range of the set U, and U represents k Is a dynamic publisher, T is a user U k+1 Selected propagation type, CTt (U) k+1 ,U k T) is the user U at time step T k And user U k+1 Cumulative total amount of comments on dynamic, ATt (U) k+1 ,U k T) is the user U at time step T k And user U k+1 A cumulative total of dynamically forwarded. In order to prevent overflow during floating point operation, a delta variable is introduced into a formula as an interference parameter, the association degree and authority influence degree are adjusted by changing the value of delta, and when the delta is approximate to infinity, the propagation probability of each user is the same. And the propagation Influence (Influence) calculation formula is to obtain a final propagation result by weighting the association degree and the authority degree by a lambda mode, as shown in formula (3). When the propagation process is finished, the result is linked with the parameter information.
Influence:P I [U k ]＝λP Correlation [U k ]+(1-λ)P Authority [U k ] (3)
In the propagation mechanism, the process of propagating dynamics for users mainly comprises five steps of changing user states, selecting propagation modes, detecting information, protecting information security and finally updating parameters. When a user browses information through the social network and generates a propagation intention, whether the current state of the user is in a state of using the social network (namely a login state) is judged. And the user respectively detects the current or uploaded copyright information by selecting a propagation mode. And storing the detected information into a chain, and generating a new dynamic serial number to provide a basis for secondary propagation. After the propagation is finished, each parameter variable and related information are updated, and the detailed steps are as follows:
step 1: the user state is changed. It is defined that information can be propagated when the state value of the user using the social network is 0 and only when the current state is 0.
Step 2: the propagation mode is selected. The propagation mode is divided into a new dynamic release mode or an original dynamic forwarding mode.
And 3, step 3: information is detected. Different detection modes are adopted for different propagation modes. When the user issues a new dynamic state or forwards the dynamic state, the copyright information is detected and recorded in the chain as the basis of copyright tracking.
And 4, step 4: and the information security is protected. And updating the copyright information watermark according to the detection result.
And 5: and completing information dissemination. And updating the parameters after the propagation is completed.
Claims (2)
1. A block chain-based social network digital content copyright protection method is characterized by comprising the following steps: the system environment is constructed and copyright protection is implemented;
step 1, system environment construction
Building a system environment, and building a social network digital content protection system framework based on a block chain, wherein the framework comprises a block chain system and a social platform, and the block chain system comprises: a data layer, a network layer, a fusion layer, a consensus layer, a contract layer and an application layer;
step 101, deploying a P2P network environment for providing a necessary network foundation for communication of each node based on a network layer;
102, constructing a root CA and issuing an authorized intermediate CA as a platform automatic authentication and authorization node;
103, defining a double-chain structure of a copyright information chain and an information transmission chain in a data layer, and configuring an encryption mode of encrypted data;
step 104, configuring a consensus strategy based on a consensus layer, and ensuring that data in all nodes in the P2P network are completely the same and reach distributed consistency;
step 105, establishing a fusion mechanism based on a fusion layer, preprocessing copyright information in a copyright information chain and propagation information of an information propagation chain by taking a Hash value as a medium, and combining digital copyright content with the copyright information and the propagation information, so that information resources can be conveniently interconnected and intercommunicated;
step 106, compiling an intelligent contract and installing, wherein the contract can be automatically called to process and return data during data access;
step 107, generating a created block by configuring the size of a single block and the time interval of block generation, and initializing a block chain system by the created block;
step 108, issuing the SDK based on the block chain system, and providing an entrance for calling a social platform;
step 109, the social platform issues an API according to the SDK provided by the blockchain system, and the data interaction between the social platform and the blockchain system is opened;
step 2, implementing copyright protection
A user registers an account number in a social platform, an API calls an intelligent contract through an SDK to apply for a certificate from an intermediate CA and return the certificate, and the user verifies, processes and returns digital copyright content when issuing, forwarding and inquiring;
A. user publishing dynamic and uploading digital rights content
Step A201, the API sends the newly uploaded digital copyright content to a block chain system through the SDK;
step A202, a block chain system receives digital copyright content and triggers a detected intelligent contract, the detected intelligent contract verifies a user certificate, if the certificate is illegal, the state and the reason of failure of certificate verification are directly returned to an API, if the certificate is legal, hash operation is carried out on the digital copyright content and the digital copyright content is sent to a fusion layer, a copyright information chain is accessed to detect whether the digital copyright content exists, if the digital copyright content exists, the existing state is returned to the API, the API returns the existing information of the digital copyright content to a terminal user, if the digital copyright content does not exist, the intelligent contract which is responsible for storing the digital copyright content is called to store the digital copyright content and return a Hash address after adding a digital watermark, after the intelligent contract which is responsible for storing the copyright information receives the Hash address, the copyright information is written into an account book of the copyright information chain, after accounting is finished, the whole network broadcasting is carried out through a consensus strategy, when the data in the copyright information chain is synchronously finished among all nodes, the intelligent contract which stores the transmission information after the transmission of the transmission information is carried out, the account book is calculated, the degree and authority are calculated, and the influence of the calculated in the relation of the content is recorded in the whole network, and the account book which is broadcast;
step A203, if the synchronization of the broadcast message in the block chain system fails, recording the abnormal message occurring during the synchronization in an error log of the block chain system, and returning the failure state to the API, if the synchronization of the broadcast message in the block chain system succeeds, returning the operation success message and the Hash address by the block chain system, storing the received Hash address and the dynamic information filled when the user issues the dynamic state by the API, and returning the success message to the user;
B. user browses other people information and forwards operation
Step B201, the API calls the intelligent contract to send to the fusion layer by sending the acquired user information and the forwarded digital copyright content to the SDK, the fusion layer retrieves the copyright information of the original work in a copyright information chain through a work Hash address, then calls the intelligent contract for storing the transmission information, calculates the association degree and authority degree through a process scheduling algorithm, calculates the dynamic influence at the moment, records the calculated influence, the currently logged user information, the original publisher information of the digital copyright content and the forwarded user information in an account book of the information transmission chain, and broadcasts the whole network after the completion;
step B202, if the synchronization of the broadcast messages in the block chain system fails, recording abnormal messages occurring during the synchronization in an error log of the block chain system, and returning a failure state to the API, if the synchronization of the broadcast messages in the block chain system succeeds, returning an operation success message and a Hash address by the block chain system, storing the received Hash address and dynamic information filled when a user forwards the dynamic information by the API, and returning the success message to the user;
C. user query for digital rights content
Step C301, when a user inquires digital copyright content information through a social platform, an API calls an SDK and triggers a detected intelligent contract, after certificate verification succeeds, the intelligent contract is accessed and an inquiry instruction is sent to a fusion layer, the fusion layer analyzes the inquiry instruction and sends the inquiry instruction to a main node of a copyright information chain and a main node of the transmission information chain respectively, the transmission information chain retrieves the transmission information after receiving the inquiry instruction, the retrieved transmission information is packaged and sent to a common node of the transmission information chain and the copyright information chain and then sent to the main node of the copyright information chain by the common node, the copyright information chain also packages the copyright information and sends the copyright information to the main node at the moment, after the main node receives and verifies the integrity of the copyright information package and the transmission information package, the fusion layer decodes data packages of the copyright information and the transmission information respectively, and splices the decoded copyright information and the transmission information according to a specified data format, after splicing, the packaged data is returned to the API, and is displayed to a user terminal.
2. The block chain-based social network digital content copyright protection method of claim 1, wherein: the influence of the user consists of two parts of relevancy and authority, and the relevancy and authority calculation formula is as follows:
in the formula (1) and the formula (2), U represents a set in the user group, k represents a constant in the range of the set U, and U represents k Is a dynamic publisher, T is a user U k+1 Selected type of propagation, CT t (U k+1 ,U k T) is the user U at time step T k And user U k+1 Regarding dynamic cumulative total of review traffic, AT t (U k+1 ,U k T) is the user U at time step T k And user U k+1 The dynamic forwarded accumulated total number and the delta variable are interference parameters, and the influence is obtained by weighting the association degree and the authority degree in a lambda mode, as shown in a formula (3);
Influence:P I [U k ]＝λP Correlation [U k ]+(1-λ)P Authority [U k ] (3)。
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