KR20040025489A - System and method for protecting digital works on communication network - Google Patents

Abstract

PURPOSE: A system for protecting digital contents in a communication network is provided to retrieve illegally distributed contents through a shared network having a P2P(Peer-to-Peer) system, and to generate/distribute files which cope with the illegal contents, thereby preventing digital contents from being illegally copied. CONSTITUTION: One or more than one relay server(30) relays shared data through a communication network(60). One or more than one list supply server(20) supplies list information to the relay servers(30). A contents protection server(10) is connected to the relay servers(30) according to the supplied list information, retrieves shared digital contents through the relay servers(30) according to preset retrieval conditions, decides an identifier of a retrieved digital contents file to calculate a dilution rate, and generates file information and access information of an authenticated digital file to be shared. The protection server(10) shares the authenticated digital contents with the communication network(60) according to the calculated dilution rate and a predetermined target dilution rate.

Description

SYSTEM AND METHOD FOR PROTECTING DIGITAL WORKS ON COMMUNICATION NETWORK}

FIELD OF THE INVENTION The present invention generally relates to systems and methods for protecting digital copyrighted works on telecommunications networks, and in particular, to reduce the illegal distribution of digital copyrighted works over a peer-to-peer shared network in a telecommunications network. The present invention relates to a copyright protection system and method for searching for illegally distributed works and generating and distributing files against them.

Recently, with the development and dissemination of peer-to-peer (hereinafter referred to as "P2P") program, the illegal distribution of works through a P2P sharing network has been popular. . P2P refers to a transient network where users connected to a communication network, such as the Internet, directly connect to another user's computer through a P2P-only application to transmit or receive various information, data, and files. In other words, P2P refers to a shared network in which all participants are suppliers and consumers by directly connecting and retrieving personal computers from existing server and client concepts. There is a method of realization and a method of directly connecting without a server by sharing personal information such as an IP address among clients in advance. Here, a peer that can be connected to a communication network refers to various digital devices such as a computer, a PDA, a mobile phone, and the like. Representative examples of such a P2P sharing network include "Napster" developed in the United States and "Sori Sea" in Korea.

However, P2P has many problems such as invasion of privacy due to the leakage of personal information, and in particular, there are problems that various digital works are freely copied and exchanged in a simple and easy way without permission of the authors through the communication network. Copyright protection of digital contents is emerging as a new demand.

Accordingly, the present invention is to solve the above problems, the present invention to prevent the illegal copying and distribution of digital works in the communication network to inspire the author's creative desire to contribute to the development of related industries, P2P scheme Its purpose is to search for illegally distributed copyrighted works through its shared network, and to create and distribute files against these illegal copies.

It is another object of the present invention to provide a system and method for protecting digital copyrighted works that can select and distribute one of a variety of options for disseminating authorized or legitimate digital files in a communication network. The selection includes no-download selection, redirection selection and corrupted / encrypted digital file selection. By providing such a variety of choices, the present invention can meet various needs for protecting the rights of a protected digital work.

In order to achieve the above object, the digital asset protection system according to the present invention is a digital asset protection system for protecting digital assets shared in a P2P manner through a communication network between a plurality of user terminals, the system is a One or more relay servers for relaying data shared through the network; One or more list providing servers providing list information to the relay server; And accessing the corresponding relay server according to the list information provided by the list providing server, searching for a digital asset shared through the relay server according to a preset search condition, determining an identifier of the retrieved digital asset file, and diluting rate. And a copyright protection server configured to generate file information and access information of an authenticated digital file to be shared and share the authenticated digital asset to a communication network according to the calculated dilution rate and a predetermined target dilution rate. It is done.

Preferably, the asset protection server accesses the corresponding relay server included in the list information provided from the list providing server through the communication network, searches for the digital asset shared through the relay server with a preset search condition, and retrieves the retrieved digital asset. A main server that receives the received information, determines whether a corresponding identifier is included, detects a dilution rate, and generates file information and access information about a digital file to be shared; And one or more secondary servers receiving file information and access information of an authenticated digital asset file to be shared from the main server through a communication network, and accessing the relay server to share the authenticated digital asset file. It is characterized by.

In addition, the digital asset protection method in communication according to the present invention is a digital asset protection method for protecting a digital asset shared in a P2P method through a communication network between a plurality of user terminals, the corrupted download file, encrypted download file, Generating an authenticated digital asset file having an identifier inserted therein, the protection type selected from the group consisting of a no-download file having a file list, and a redirection file; Searching for a digital asset file shared by the communication network, and determining whether the retrieved digital asset file has an identifier to determine whether the retrieved copyrighted work is illegal; Collect illegal digital works shared in the communication network such that at least a portion of the response received by the user terminal is based on the authenticated digital copyrighted work, thereby collecting the authorized digital copyrighted work in response to a user query for each digital copyrighted work. Distributing information relating to the information; And sending a certified digital asset file including one of the corrupted download file, the encrypted download file, the no-download file, and the redirection file if a request is sent from a user for the authenticated digital asset file. It features.

1 is a schematic block diagram of a digital asset protection system in a communication network according to an embodiment of the present invention.

2 is a flowchart schematically illustrating a method for protecting digital copyrighted works in a communication network according to an embodiment of the present invention.

3 is a diagram illustrating a process of creating and registering a digital asset file according to an embodiment of the present invention.

4 is a diagram illustrating a process of searching for approved or legitimate digital works being shared in a communication network and generating digital files and access information to mitigate the dissemination of unauthorized or illegal works according to an embodiment of the present invention.

5 is a diagram illustrating a process of sharing a digital asset by accessing a corresponding relay server from a main server according to an embodiment of the present invention.

6 is a diagram illustrating a process of being redirected to a corresponding web server according to one embodiment of the present invention.

Hereinafter, a digital copyright protection system and method in a communication network according to the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

1 is a schematic block diagram of a system for carrying out the present invention. The system for carrying out the present invention includes an asset protection server 10, one or more list providing servers 20, one or more relay servers 30, a plurality of user terminals 40, and mutually. It comprises a communication network 60 for connecting to transmit and receive data. In addition, the asset protection system may further include a web server that can be redirected and connected through the communication network 60, that is, one or more web servers 50 operated by the author, the manufacturer, or the sales company.

The communication network 60 allows data communication between the copyright protection server 10, the list providing server 20, the relay server 30, the user terminal 40, and the web server 50. An example of an information communication network connected by wire or wirelessly is the Internet.

The user terminal 40 is a device capable of transmitting and receiving digital copyright data between each other in a P2P manner through the communication network 60 and is various digital devices such as a computer, a PDA, and a mobile phone.

The relay server 30 plays a role of relaying so that users can share digital works in a P2P manner in a communication network.

List providing server 20 provides a list of the IP address or Port number of the relay server 30. The list providing server 20 is a relay server to which a terminal of a general user makes initial access when executing a specific search program. The access information of the user terminal, that is, the IP address or the port number is provided to the list providing server 20 at the same time as the initial access.

The asset protection server 10 accesses the corresponding relay server 30 according to the list information provided from the list providing server 20 to search for digital assets shared through the relay server 30 with preset search conditions. Detects the dilution rate, and first determines the number of files to be shared to achieve the target dilution rate, and generates the file information and access information of the determined file to share the protected work file. In addition, in the case of a file for which the redirection function is set, the file is redirected to the web server 50 when the file is executed.

The asset protection server 10 may include a main server 11 and one or more secondary servers 15.

The main server 11 is connected to the relay server 30 according to the list information provided from the list providing server 20 through the communication network 60 and shared through the relay server 30 with a preset search condition. Search for digital works, determine whether the searched works are included, determine whether the searched works are illegal, detect the dilution rate, and first determine the number of files to be shared to achieve the target dilution rate. And creates file information and access information about the copyrighted work. The main server 11 is provided with a storage unit 12 and a database 13 for storing data.

The secondary server 15 receives the file information and the access information of the work to be shared from the main server 11 through a communication network to access the relay server to share the work.

The primary server 11 and the secondary server 15 may be connected to a local area network such as a local area network (LAN). For the security of the internal system, using the existing switch equipment, the IP address used internally is a private IP, and the public IP is used for external access. It is desirable to allow limited.

Next, a preferred embodiment of a digital asset protection method in a communication network according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart schematically illustrating a method for protecting digital copyrighted works in a communication network according to the present invention.

The administrator creates, registers and stores the protected work in the copyright protection server 10 (S10). File creation and storage involves entering identification information about the work and information related to the level of protection granted to the work. According to the present invention, the protection steps include (a) corrupting or encrypting a copyrighted work, (b) specifying no download, or (c) redirecting a user who wishes to download a file to an associated website. In addition, an identifier may be inserted into the digital copyrighted file to identify the legitimate copy of the protected copyrighted work.

The protection server 10 accesses the corresponding relay server according to the list obtained from the list providing server, searches for a file corresponding to each copy of a specific work shared through a communication network, and determines whether the file is illegal. (S20).

The legality of the distributed work may be identified by an identifier inserted into the file by the administrator. In other words, whether the work is legal or not is identified by the identifier. Also, in step S10, the detection dilution rate is determined. The detection dilution rate can be calculated as the ratio of the number of legitimate works to the total number of currently distributed works in the network.

Next, the protection server first determines the number of files that the digital asset protection system of the present invention should be shared with the P2P file sharing network. The determination is made by comparing the predetermined target dilution rate with the detected dilution rate. The target dilution rate set is defined as the percentage of legal or certified copies of the protected work that the copyright holder wishes to exist in the network. In such a case, it may include a legitimate or authenticated copyrighted work damaged or encrypted file, a no-download file, or a redirect file. For example, if a protected asset is set at a predetermined target dilution rate of 90 percent, and the network currently has a dilution rate of 50% of 100 files (i.e. 50 illegal and 50 legal files), the system Will share 400 files on the P2P file sharing network to achieve the desired target dilution rate (i.e., 450 out of 500 total files on the network will be legitimate). Once the number of files to share is determined, the system distributes the stored digital asset files over the network to protect the copyrighted work as a legal or authorized copy of the copyrighted work.

Thereafter, if there is a transmission request from the user terminal for the shared file, the file list or the corresponding file is transmitted to the user terminal according to a condition set for the corresponding distribution file (S40). In accordance with the present invention, (a) a pre-set condition is to transmit a corrupted or encrypted file to the user, (b) send a file list that is not downloaded and only the user can recognize, or (c) redirect the user to the associated website. It may include sending redirection information (ie, hyperlink) to the user for the purpose.

Through the above process, a file with an identifier inserted against the illegal copy is generated and distributed to the communication network, thereby reducing the distribution of the illegal copy.

Hereinafter, the execution process of the copyright protection method according to the present invention according to a preferred embodiment of the present invention will be described in detail.

First, a process (S10) of generating and registering a digital asset file according to the present invention is illustrated in FIG. 3.

First, the administrator receives the information on the protected asset file or file from the customer, and inputs it to the main server 11 (S110). Here, the customer may be an author who creates a work and a copyright owner who sells and distributes the work. For example, it may be a singer, an author, a record label, a publisher, a film company, a company that creates and distributes software.

The information that the administrator obtains and inputs from the customer about the asset may be, for example, a distribution file type, author, performer, album name, asset file name, track number, or the like. The address of the web server can be included.

The type of input file can be categorized by three options: distorted / noise / encrypted, no-download, and redirection.

First, it is selected whether to select a no-download (S120). No-Download means that when a user searches for the copyrighted work in the network, only the search result is obtained and no download request is processed. That is, when no-download is selected, only the index list (file list) of the file is generated without generating the file (S130) and shared to the P2P network, and the user is informed that the download is not allowed. If no download is selected, that is, a corrupted or encrypted file or a file including redirection information is selected, the file is generated and shared to the P2P network.

Next, it is asked whether to redirect (S140). Redirection selection causes the asset file to be linked to the redirection file. Automatically open a web browser to users who want to download a work file, and provide a copyright holder's website and the like related to the file. Therefore, if the redirection selection is made (S150), the relevant web information, that is, the relevant URL address and the like are linked to the digital file.

To this end, it serves as an interface for connecting users and copyright holders by associating file information and author information with each other in a database of a redirection web server. In other words, the redirection selection redirects the user to the website by URL address, and provides additional information about the author or copyright holder and the like and information about the digital work for user search.

After inputting the above information, create a file using tools such as Windows Media Rights Manager (WMRM), Real System Development Kit (SDK), WinAmp SDK, etc. Create a file (S160).

Next, file information is input to the redirect web server, and the input file information is a copyright holder, a file name, a unique ID of a file, a site address to be connected, and the like (S170).

The input file is registered in the main server 11 for the service and distributed to the P2P network to be shared.

If no download and redirection are not selected, the protected digital file is distorted / noise / encrypted to generate a file (S180).

The compromised / encrypted files referred to in the present invention are public relations (PR) digital files, deteriorated digital files, and encrypted digital files. Typically, copyright holders distribute promotional files to promote the sale of digital works. For example, a promotional file is a means for providing a demonstration to a user by extracting a portion from a completed work that allows the user to access a portion of the work. In addition, the promotional digital file may include an interstitial advertisement or author's interview, the table of contents, etc. to promote the sale of the original work.

A digital file with reduced quality is a digital asset produced by significantly reducing the original quality of the copyrighted work. For example, in the case of a digital music file, the digital file is produced by degrading the sound quality of the original record. It is produced by degrading image quality and sound quality. For example, as a method of lowering or damaging the sound quality of a digital music file, a method of inserting noise components such as a promotional voice of a singer or a performer between sounds and a method of lowering a sampling rate (for example, MP3 format) The digital file has a sampling rate of approximately 44.1 kHz), a method of distorting a sound waveform, and a method of converting a multichannel sound into a single channel sound.

The encrypted digital file is encrypted using a known encryption algorithm. The encryption algorithm may use any of a known symmetric key encryption algorithm and a public key algorithm. It is preferable. For reference, a public key encryption algorithm, also known as an asymmetric key encryption algorithm, has a different characteristic from a key used for encryption and a key used for decryption. One of these keys is called a private key and the other Is called a public key. In general, encryption is a public key and decryption is a private key. In the present invention, when the public key encryption algorithm is used, only an individual having a private key can decrypt the digital file by encrypting with a public key certified by a predetermined certification authority.

In addition, one or more predetermined identifiers are inserted into the distortion / noise / encrypted file. The identifier inserted into the file allows only an administrator to identify it. For example, the identifier may be a watermark and may be inserted at the front, rear or front and rear of the digital file. In addition, the identifier may use an MD5 (Message Digest) or SHA1 (Secure Hash Algorithm) value used as a unique value of the file. These values are unique to the file that is assigned to the file by the host's operating system at the time the file is created.

The insertion position of the identifier is determined according to the transfer start position of the file according to the transfer agreement promised between the main server 11 and the relay server 30. That is, when a transmission request is made for a predetermined digital file from the main server 11 to the relay server 30, if the transmission starts from the front of the digital file from the relay server 30, the identifier is inserted in the front part, and the relay server If transmission starts from the rear of the digital file from 30, the identifier is inserted at the rear of the digital file.

If the transfer protocol promised between the main server 11 and the relay server 30 is unclear or the transfer protocols are different between the relay servers, an identifier may be inserted at both the front and the rear of the digital file.

As such, the reason for determining the insertion position of the identifier according to the transfer start position of the file according to the transfer agreement promised between the main server 11 and the relay server is as described later. This is because it detects whether an identifier exists in the corresponding digital file (that is, whether the digital asset file is a copy of a legal or authorized copyrighted work).

A method of generating a file by the administrator inputting information on a protected work and selecting the selection function described above is as follows.

First, when the administrator applies power to the main server 11 and runs the main server 11, the shared search program for the main server is stored in advance. It is loaded into memory and executed by the processor. As described below, this search program identifies illegal copies of digital works in the network and determines the current actual dilution rate for each digital work. When the shared search program for the main server is executed, the main server 11 displays the user interface screen of the shared search program for the main server through the display device. In this interface screen, the administrator inputs information about the protected work and selects an option to generate a file, that is, a no-download digital work, a redirect file, or a distortion / noise / encryption file.

As described above, after the file is generated, it is registered in the main server 11 (S190). The asset file registered in the main server 11 and information about the same are stored in the storage unit 12 or the database 13 of the main server, and as will be described later, the main server 11 displays illegal works shared in the communication network. Based on the number of illegal copies retrieved and distributed in the network and the target dilution rate, the authenticated files against them as a response to a user query for each digital asset, i.e. the list of files described above (i.e., no-download files) , Distortion / noise / encrypted files, and redirect files are distributed and shared on the network.

Hereinafter, a process of searching for illegal digital assets shared in a communication network and distributing files on the communication in response to a user query for each digital asset in order to dilute the number of illegal copies in the communication network according to an embodiment of the present invention. Explain about.

First, in order to provide the main server with a list identifying the relay server and / or user terminal in the network by the address, the main server 11 accesses the list providing server 20 and receives the list to receive the relay server 30. ) To search for digital works that are illegally shared in the communication network, and calculate a dilution rate to determine whether there are illegally shared searched digital works. Thereafter, the number of authorized files to share in the network is determined to achieve a predetermined dilution rate.

Hereinafter, a process of generating file information and access information against a file that is illegally copied in the communication network according to the present invention will be described with reference to FIG. 4.

The main server 11 accesses the communication network 60 through a network access device and then accesses the list providing server through the communication network (S210), and transmits a signal requesting transmission of the list information to the list providing server. (S220). Here, the network access device is a device for connecting the main server 11 to the communication network to perform data communication, and may be a channel service unit (CSU) or a digital service unit (DSU), a router, or the like. It may include.

The main server 11 checks the response from the list providing server 20 and stores the requested list information when receiving the requested list information (S230), and releases the connection with the list providing server 20 (S240). Here, the list information received from the list providing server 20 may be stored in the database 13 through the storage unit 12 or schema conversion and mapping process of the protection server. If no list is received from the list providing server, the main server sends a request to the list providing server for a list.

After receiving and storing the list, the main server 11 accesses the communication network and accesses the relay server 30 according to the list information (S250). The connection from the main server to the relay server is made by the administrator or by the automatic execution algorithm of the shared search program for the main server. In this case, the main server 11 may be sequentially connected to each relay server 30 in a preset connection order. The connection order to the relay server 30 may be arranged in order of the IP address of the relay server, for example.

The main server 11 transmits a preset search condition to the relay server to perform a search for the asset file shared in the communication network (S260). The search condition is set by the administrator through the user interface screen of the shared search program for the main server. For example, the search condition may be the author or the name of the work.

Next, the main server 11 receives a search result from the relay server 30, and determines whether the search result matches a preset condition (S270). The search result may include information for calculating a dilution rate which is a ratio of illegal files available in the P2P shared communication network in the main server 11. If there is no search result corresponding to a preset condition (when there is no digital work of the type requested by the user in the communication network), and there is no digital file already created and stored in the storage unit 12, the protection server ( 10) generates a file list (ie, no-download file) to be shared and a distortion / noise / encrypted file according to the instructions of the copyright holder (S280). The copyright protection server 10 also generates information about the digital files to be shared (such as file list information and file characteristic information identifying IP addresses to be provided to the user according to the search results of each digital asset), and generates information in the database 13. Save it.

If there is a search result corresponding to a preset result, the main server 11 receives only a part of the searched digital file from a predetermined user terminal connected to the relay server through a communication network (S290). As a method of receiving only a part of the retrieved digital file, for example, the main server 11 transmits a digital file transmission request signal to a user terminal connected to a relay server, and then receives the digital file from the corresponding user terminal. There is a way. Transmitting a digital file from the user terminal to the main server is a predetermined portion sent by the user terminal and received by the main server.

The main server 11 receives the digital file to determine whether the digital file in the communication network has an identifier embedded in the file. As mentioned above, the identifier authenticates whether the digital file is legal or a file. The main server 11 receives a part of the file according to the appropriate transfer protocol because the initial part of the transmitted file indicates whether an identifier exists. By receiving only a portion of the entire digital file, the retrieval time is reduced and the asset protection server 10 maintains its storage capacity.

Next, an identifier (e.g., watermark, MD5, SHA1, etc.) is searched in the received digital file to determine whether the identifier exists (S300), and the determination result is stored in the storage unit 12 of the main server 11. It is stored in data form or stored in the database 13.

If the same identifier as the identifier input by the administrator exists in the received digital file, a "pass" determination is made for the file (S310). If the identifier does not exist, a "fail" determination is made (S320). Passing files are certified or legitimate digital files, and failing files are illegal digital files.

Next, it is determined whether there is an additional digital file, and if so, the file is accessed (S330) to determine whether the file has an inserted identifier (either a valid file or a failed file).

After determining the received file as described above, the main server 11 may include calculating a dilution rate (S340). Dilution rate refers to the ratio of accepted files to the total number of files retrieved from the network.

The calculated dilution rate can be provided to the customer or used by the administrator as a reference for the management of the protection server. According to one embodiment according to the invention, the calculated dilution rate is compared with a predetermined target dilution rate to determine the number of authorized digital works to distribute on the communication to achieve the target dilution rate.

Next, the main server 11 generates files to be shared according to the owner's instructions, that is, file lists (i.e., no-download files), distortion / noise / encrypted files, and redirection files. The copyright protection server 10 generates information about a digital asset file to be shared (data list information and file characteristic information for recognizing an IP address provided to a user according to a search result for each digital asset) and the database 13. Store in

The main server 11 determines distribution for system resources according to the list of found works. That is, the secondary server 15 to share the digital file for each asset list is determined, and the access information for each list, for example, an IP address and a port number for the corresponding relay server, are generated and stored in the storage unit 12. Or store in the database 13 (S360).

After completing the above-described process, the main server 11 proceeds to the next list from the current list, or terminates the control operation.

In operation, a user may enter a query for one or more digital assets identified by the author, title, and the like. If the digital work is protected by the present invention, the actual dilution rate of the digital work in the network is determined by reviewing the network as described above or by canceling the actual dilution value of the digital work determined and stored when the digital work was registered. do. The number of responses provided by the main server 11 is determined by the list of responses received by the user for the query to determine a predetermined or desired dilution rate. For example, users typically use a file list to identify the number of files that can be accessed over a network to meet the needs of a query. Typically, additional file characteristic information can be provided if each file in the file list is identified by an IP address or the like. According to the invention, the main server 11 is responsible for responding to the queries (each response provided by the main server indicating a link to a file list (i.e., no-download file), a distortion / noise / encrypted file and a redirect file). Providing the number, the resulting list to the user has the ratio of links to the certified version of the digital work to the total number of links (certified and unauthenticated) equal to or greater than the predetermined or desired dilution rate value. . The user selects one of the links from the list to access the digital work represented by the link.

Next, a process in which the secondary server 15 accesses the corresponding relay server 30 under the control of the main server 11 and shares the digital asset determined to be shared by the main server 11 will be described with reference to FIG. 5. do. Sharing of the digital asset by the relay server 30 performs a response selected by the user of the link associated with the digital asset from among the various links displayed in the list resulting from the user's query.

When the administrator applies power to the auxiliary server 15 and executes the shared program for the secondary server stored in the secondary server 15, the shared program for the secondary server is loaded into the main memory of the secondary server 15 and the processor Is executed by

The secondary server 15 connects to the main server 11 through a communication network preset by the shared program for the secondary server executed (S410), and waits (S420).

In the standby state, the secondary server 15 determines whether the share execution command is performed from the main server 11 through the internal communication network (S430), and if it is not received from the main server 11, the result is returned again. Will continue to wait.

If the share execution command is received from the main server 11 via the internal communication network, the secondary server 15 obtains file information to be shared with the access information of the corresponding relay server to be connected (S440). In the information acquisition method, the main server 11 transmits a shared execution command and retrieves data stored in the database and the storage unit, and retrieves the connection information of the corresponding relay server to be connected to each secondary server 15 and file information to be shared. Alternatively, each secondary server 15 accesses the database and storage unit of the main server 11 according to a preset value, accesses the information, and reads the file information to be shared with the access information of the corresponding relay server to be accessed. Can be.

Next, the secondary server 15 accesses the relay server according to the obtained access information, and attempts to log in by inputting an ID and a password (S450).

Next, the secondary server 15 determines whether a signal for successful login and access permission is received from the relay server after a predetermined time (S460), by transmitting the list information on the digital file to be shared to the relay server when the connection is allowed. The information on the file to be shared is shared so that users can freely browse (S470). If the connection fails, connect to the relay server again and try logging in again.

Next, when the secondary server 15 receives a transmission request for the digital file from the user terminals connected to the currently connected relay server, the secondary server 15 waits to transmit the digital file (S480).

In the standby state, the auxiliary server 15 determines whether a transmission request for a digital file is received from user terminals connected to a currently connected relay server (S490).

When the transfer request for a file is received from the user, the auxiliary server 15 opens a communication port to the user terminal that has delivered the transfer request, and transmits the information requested by the user to the user terminal using the open communication port. Allow access of the user terminal (S500).

Subsequently, the secondary server 15 transmits the requested digital file to the corresponding user terminal through the information communication network, where the transmitted file is selected for each of the above-described distortion / noise / encrypted file, no-download and redirection. According to the corresponding file. That is, in the case of the asset selected for no-download, only the file list is transmitted (S510). In the case of the asset selected for downloading, the distortion / noise / encrypted file is transmitted (S520). The file holding the file is transmitted (S530).

In the transmission method, the file is received in advance from the main server 11 and stored and then transmitted to the user terminal requesting the transmission, or whenever the transmission request is made, the corresponding digital file is read from the main server 11 through the local communication network. It can also be sent to the user terminal.

When the transmission is completed, the secondary server 15 transmits the details (for example, a file name, a transmission time, etc.) of transmitting the asset file to the main server 11 (S540).

If the transmission request is not received from the user terminal during the predetermined time during the transmission standby, the control command instructing to log out from the main server 11 is received and the connection with the connected relay server is released (S550).

A user who receives a digital file distributed in a communication network according to the present invention will execute the file, and if the executed file is a distortion / noise / encrypted file, it will be executed according to each function, and a work selected for no-download In this case, the search list is only displayed and cannot be downloaded. In addition, if the file containing the redirection information is redirected to the web server.

6 is a diagram illustrating a process of being redirected to a web server when a digital file is executed in a user terminal in the case of a redirection file according to an embodiment of the present invention.

First, when the user executes the file, the default browser specified in the general user's PC is displayed, and the redirection web server is read by reading the address and unique ID of the redirection server included in the file. (S610). At this time, the screen of the redirect web server page is not seen like a normal web page. Instead, the URL of the relevant site that matches the ID with the ID value is obtained from the internal database and the relevant copyright holder, record label or software is downloaded to the explorer of the user terminal. Link directly to the company you created.

It is determined whether the ID of the file, that is, the ID associated with the digital asset with the subject of the user query matches the ID of the redirect web server (S620), and executes a file containing other site main redirection information matching the ID. If there is another site address (: Business partner link) that matches the ID, the redirect web server will redirect the user's terminal to the homepage by the URL of the site and the author, record company or software company for each digital file. However, if there is no match information (S630), the URL of the web page produced by default is transmitted to the user and redirected (S640).

The information of all users (IP address, redirection site, etc.) linked by the redirect web server and basic information of the matching file are recorded in the database of the main server 11 (S650).

As described above, the present invention prevents illegal copying of digital works by generating and distributing files against illegal copies distributed in a P2P manner in a communication network, thereby increasing the sales of copyright holders' works online and offline. It is effective to inspire creative motivation.

In addition, the present invention has the effect of preventing the sales volume of the copyrighted work indirectly reduced by preventing illegal copying and distribution of the digital copyrighted work in the communication network.

As described above, the present invention relates to a system and method for protecting a copyrighted work by searching for an illegal copy in circulation in a communication network, and generating and sharing a copyrighted file corresponding thereto. It may be converted, substituted and replaced, and is not limited to the above.

Claims (11)

A digital asset protection system for protecting digital assets shared in a P2P manner through a communication network among a plurality of user terminals, the system comprising: One or more relay servers for relaying data shared through the communication network; One or more list providing servers providing list information to the relay server; And Based on the list information provided by the list providing server, the corresponding relay server is accessed, the digital asset shared through the relay server is searched using a preset search condition, and the dilution rate is calculated by determining the identifier of the retrieved digital asset file. And a copyright protection server configured to generate file information and access information of an authenticated digital file to be shared and share the authenticated digital asset to a communication network according to the calculated dilution rate and a predetermined target dilution rate. Digital copyright protection system in the network. The asset protection server of claim 1, wherein Access to the corresponding relay server included in the list information provided from the list providing server through the communication network, search for a digital asset shared through the relay server with a preset search condition, and receive the retrieved digital asset, and include the identifier. A main server for determining whether there is a dilution rate and for generating file information and access information about the digital file to be shared; And And receiving one or more subordinate servers receiving file information and access information of an authenticated digital asset file to be shared from the main server through a communication network, and accessing the relay server to share the authenticated digital asset file. Digital copyright protection system in a communication network. The system of claim 1, wherein the digital file is selected from the group consisting of a corrupt download file, an encrypted download file, a no-download file having an associated file list, and a redirect file. 4. The system of claim 3, further comprising one or more web servers to which the user is redirected upon executing the redirect file. In the digital asset protection method for protecting digital assets shared in a P2P manner through a communication network between a plurality of user terminals, Generating an authenticated digital asset file with an identifier inserted therein, the protection type being selected from the group consisting of a corrupt download file, an encrypted download file, a no-download file having an associated file list, and a redirect file; Searching for a digital asset file shared by the communication network, and determining whether the retrieved digital asset file has an identifier to determine whether the retrieved copyrighted work is illegal; Collect illegal digital works shared in the communication network such that at least a portion of the response received by the user terminal is based on the authenticated digital copyrighted work, thereby collecting the authorized digital copyrighted work in response to a user query for each digital copyrighted work. Distributing information relating to the information; And If there is a transmission request from the user for the authenticated digital asset file, transmitting the authenticated digital asset file including one of the corrupted download file, an encrypted download file, a no-download file, and a redirect file. Digital copyright protection method in a communication network. 6. The method of claim 5, further comprising the step of redirecting the user to the web server when executing the redirect file. In the digital asset protection method for protecting digital assets shared in a P2P manner through a communication network between a plurality of user terminals, Inserting an identifier in the authenticated digital asset file and storing the authenticated digital asset file; Retrieving a digital asset file shared in the communication network; Receiving at least a portion of the shared work and determining if there is an identifier; Calculating a dilution rate that is the total number of files in which identifiers of digital asset files shared in the communication network are present versus digital asset files shared; Determining the number of authorized digital files to distribute to the communication network to achieve a predetermined target dilution rate; Providing the user host with information about the number of authorized digital asset files in response to a query from the user host for each digital asset; And distributing one of the digital asset files authenticated to the user host if a request for transmission of the digital asset file is received from the user terminal. 8. The method of claim 7, wherein said identifier is a watermark. 8. The method of claim 7, wherein the digital asset file is selected from the group consisting of a corrupt download file, an encrypted download file, a no-download file having a list of related files, and a redirect file. 8. The method of claim 7, further comprising the step of redirecting the user to the web server when executing the redirect file. 8. The method of claim 7, wherein the step of determining the number of authenticated digital asset files distributed to the communication network to achieve the predetermined target dilution rate is determined after the identifier is present, and the dilution rate which is the pass rate for the number of judgments is determined. And calculating the number of files to be calculated and distributed.