JP2006065488A - Method of monitoring content distribution system for illegal activity, content distribution system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring function for discovering illegal contents and their senders in a P2P content distribution. <P>SOLUTION: The content distribution system includes a content service terminal 4, a content sending terminal 2, a metadata-to-be-monitored management terminal 6, and a patrol terminal 7. The management terminal 6 has a DB 9 for extracting content description metadata showing copyrighted works, and a management DB 8 for the metadata distributed over a network 1. The management terminal 6 specifies a network that includes a terminal sending the metadata to be monitored among a list of metadata monitored in the copyrighted work DB 9. The patrol terminal 7 sends search information that corresponds to the specified network, and if any illegal activity such as copyright infringement or content alteration has been found, warns of the suspected terminal of the illegal activity, and stops the distribution of the contents if necessary. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a content distribution system, and more particularly to a fraud monitoring method for protecting copyright of content and preventing falsification adapted to a P2P (Peer-To-Peer) distribution form that has recently appeared.

  Various content distribution systems for distributing various digital contents such as digitized documents, moving images, still images, and audio via a network have been proposed. As a content distribution system having a copyright protection function for content, as disclosed in, for example, Patent Document 1 “Content management system with expiration date, management method, and recording medium on which information is recorded”, generally, The following methods are used.

  When content is distributed, the content is transferred to the copyright protection server, the content protection server is requested to encapsulate the content, and the content is stored in the form of a capsule in the content distribution server. Here, encapsulation is a content ID (identification number) information attached to content, copyright information such as author, date of publication, issuer, etc., and encryption that can be decrypted by a predetermined application. By using the encryption method, at least a part is encrypted, digital watermarking is performed, content availability conditions are set when content is used, it can be used only when the condition is satisfied, and it is disabled when the condition is not met It refers to giving capsule control programs and processing them into inseparable files.

  The content user receives the content in the above encapsulated format. The distributed content can be reproduced by a predetermined reproduction application on the content user's terminal. This encapsulated content cannot be played back except for a predetermined application, and cannot be restored. On the content use terminal, it is not possible to extract or save only the content from the capsule.

  Also, in this system, when a content user requests the use of content at the use terminal, the capsule control program included in the capsule operates, and the copyright protection server uses the use time, use time limit, use permission terminal ID. An inquiry is made as to whether the usage conditions are satisfied. If approval of the copyright protection server is obtained, the content in the encrypted capsule is decrypted and the content is reproduced.

  In such a content distribution system having a conventional copyright protection function, all encapsulation is performed on the copyright protection server, and all capsules to be distributed are placed on the content distribution server, Content distribution is performed in a client-server manner from the content distribution server to the user terminal.

  On the other hand, at present, a form called P2P (Peer-To-Peer) is spreading as a form of data distribution in the network. In general content distribution, each user downloads a file from a server managed by a business operator, etc., whereas P2P does not have a server that stores digital content in a centralized manner. Digital contents stored on a personal computer can be exchanged directly. Typical examples using the P2P technology include Gnutella and Napster. As a characteristic of P2P content distribution, there is a distribution form in which content is distributed from a content user to another content user in addition to a distribution form in which content is distributed from a content author to a content user. With this feature, the content can be reused and the content distribution can be activated.

  The merits of P2P content distribution are as follows: 1) Costs can be greatly reduced compared to the conventional client / server model. Resources and computing power are distributed throughout the network, eliminating the need for expensive central servers, reducing centralized management, centralized storage, and other resource costs. 2) With P2P, all data and messages are individually 3) P2P improves the fault tolerance of the network because it is easy to protect privacy. Since there is no part where functions essential for network operation are concentrated, even if several nodes go down, the whole network will not go down. 4) With P2P, the network can be expanded just by adding terminals. And so on.

  A general disadvantage of P2P content distribution is that in the world of file exchange using P2P such as Winny, which is a problem in recent years, there are many illegal content distributions contrary to public order and morals. However, according to the conventional P2P technology, since illegal copying ignoring the copyright of the content cannot be prevented and the user cannot be specified, the copyright is illegally infringed, leading to the disadvantage of the copyright owner. It was. Therefore, companies operating a platform for exchanging files could not secure a clear source of revenue.

To deal with this problem, Patent Document 2 proposes a “copyright protection distribution system by encapsulation”. In this system, when a copyright protection terminal is provided in the network, and the content sender is permitted to encapsulate the content from this terminal, the content use condition is satisfied when the content is used for the specified content. Only a capsule control program for making the content available is added to make these inseparable capsules.
Japanese Patent Laid-Open No. 11-296437 JP 2003-256596 A

  The system proposed in Patent Document 2 is adapted to copyright-protected content distribution for content distribution that can be applied from the conventional server / client type to the P2P type. However, when encapsulating, this system does not take measures against falsification of metadata and content, and further, the function of stopping the distribution of illegal content on the network has not been considered. In a situation where everyone can encapsulate content, it is considered that illegal acts such as copyright infringement occur, such as falsifying and encapsulating content that is subject to copyright protection as content that was copyrighted by the user.

  Conventionally, methods for detecting fraud have been based on patrol monitoring by hand and reports from victim users. The former method has a problem that it is difficult to monitor a large number of contents, and the latter method has difficulty in detecting fraud in real time and preventing the spread of damage.

  In view of the above problems, an object of the present invention is to automatically extract metadata that may be fraudulent on the network to find fraudulent terminals, and in some cases, stop distribution of the content Another object is to provide a fraud monitoring method and a content distribution system in a content distribution system.

  In order to prevent digital content from being illegally distributed through a network, the present invention monitors a monitoring metadata management terminal in addition to a content use terminal and a content transmission terminal, and monitors unauthorized content using the same. A patrol monitoring terminal is provided.

  The monitoring metadata management terminal requires content description metadata that describes the content of the content in a capsule that is at least partially encrypted with a cipher that can be decrypted by a predetermined browser in the content use terminal, In order to ensure the consistency of the search information (metadata), a distribution metadata management database that performs collective management of distributed metadata is provided.

  The metadata describing the contents of the content must be made inseparable by using a technique such as digital watermarking in order to prevent fraud such as tampering by a third party other than the author. However, since the search information needs to include the description of the owner of the content, it must be arranged separately from the content description metadata. To ensure consistency between the search information and content description metadata, the distribution metadata management terminal logs each metadata and checks the soundness in the network when the content creator issues an encapsulation request. To do.

  If the search information and the content description metadata from the content transmission terminal do not match, the distribution metadata management terminal can detect that the content transmission terminal has tampered with the information and issue a warning to the corresponding terminal.

  The monitoring metadata management terminal is a terminal that extracts metadata that exists in the network and that may be fraudulent, and includes search information transmitted from a user terminal device that can exchange files by P2P, It has a comparison function that records content description metadata associated with encapsulated digital content and collates them with data in a copyright database.

  The patrol monitoring terminal transmits the search information to the network to which the monitoring-required terminal actually belongs, using the metadata that may be illegal content selected by the above-described monitoring-required metadata management database. The tour monitoring terminal reads the content of the capsule hit in the search by the browser, and browses and executes the content as in the normal content using terminal at the tour destination. At that time, it is possible to confirm whether the acquired content matches the content description metadata such as the title and author.

  The patrol monitoring terminal detects that the content transmission terminal has tampered with the information if the content does not match the search information and / or the content description metadata. In addition, if there is a possibility that the content is in violation of copyright, it is possible to clearly indicate that the terminal and content are allegedly violating copyright law, and depending on the situation, control can be performed so that suspicious metadata cannot be registered at the search stage. To.

  The tour monitoring terminal can act as a spyware that reads the IP address, download port number, and the like of the corresponding content transmission terminal when executing the program at the tour destination. In addition, the program can be evolved to deal with newly discovered fraud.

  According to the present invention, which is suitable for P2P content distribution, that is, a characteristic of P2P content distribution, 1) secondary distribution of content is possible, 2) server content is not involved in content distribution, and at the same time copyright protection function However, it is possible to grasp the usage status of the content distributed on the network while securing the merit of P2P content distribution that has high scalability by eliminating the server concentration in the network as much as possible and eliminating the server concentration in most processes. By implementing file fraud monitoring, it is possible to construct a content distribution system that eliminates the disadvantages of P2P content distribution.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of a content distribution system according to an embodiment of the present invention.

  As shown in FIG. 1, this content distribution system is equipped with a content transmission terminal 2 for transmitting digital content via a network 1 equipped with a program (content distribution log) 3 for recording metadata when content is transmitted. A content use terminal 4 that receives a digital content via the network 1 and a content distribution log 3 and 5 that are equipped with a program (content distribution log) 5 that records metadata when receiving the content. The network 1 is managed based on the monitoring metadata management terminal 6 that manages metadata associated with the content distributed on 1 and collates with copyrighted material data, and the matching result of the monitoring metadata management terminal 6 that requires monitoring. It has a patrol monitoring terminal 7 for finding the above-mentioned illegal content. Here, only one each of the content transmission terminal 2, the content reception terminal 4, and the patrol monitoring terminal 7 are illustrated, but in reality, there are many content transmission terminals 2 and content reception terminals 4 for each content. Further, a plurality of patrol monitoring terminals 7 exist depending on the number of monitoring metadata required to be distributed on the network 1 and are connected to the network 1. Usually, only one monitoring metadata management terminal 6 exists on the network 1, but a plurality of monitoring metadata management terminals 6 may be provided. A method of using the plurality of copyright-required monitoring metadata management terminals 6 for each content type (for example, music, still image, moving image, etc.) is also conceivable.

  Here, as the network 1, an IP network such as the Internet or a semantic information network is assumed, but other networks may be used. In this content distribution system, communication and data exchange among the content transmission terminal 2, the content use terminal 4, the patrol monitoring terminal 7, and the monitoring metadata management terminal 6 required are all performed via the network 1.

  Next, the metadata distribution route will be described with reference to FIG.

  There are two types of metadata distributed in the network 1, that is, content description metadata describing the content contents when the content transmission terminal 2, which is the content-owning terminal, creates the content, and a search request from the content use terminal 4. This is metadata of search information given outside the encapsulated content. The content description metadata is stored in the content distribution log 3 when the content is encapsulated. The search information is received when the content use terminal 4 receives the content from the content transmission terminal 2 and stored in the content distribution log 5. The two types of metadata are managed by the distribution metadata management database 8.

  The distribution metadata management database 8 performs batch management of metadata distributed on the network 1 and confirms the match between the search information and the content description metadata from the content transmission terminal 2. In addition, a copyright protection database 9 is set up by a copyright organization or the like. The monitoring-required metadata management terminal 6 compares the data in the copyright database 9 with the data in the distribution metadata management database 8, extracts the metadata that needs to be monitored, and sends it to the patrol monitoring terminal 7. To do.

  Next, the configuration of the content transmission terminal 2 and the content distribution log 3 will be described with reference to FIG.

  The content transmission terminal 2 outputs the corresponding content to the content use terminal 4 based on the content search request from the content use terminal 4. The content transmission terminal 2 responds to the content search request from the content use terminal 4, and based on the search information set 20 from the content use terminal 4, the content transmission terminal 2 stores the content held by the terminal connected to the network 1. A metadata search response unit 21 that performs a search, a content transfer request response unit 22 that requests transmission of the optimum content from the content held by the content owning terminal 2 as a search result, the selected content 23, Metadata 24 describing the content, owner, creation date, etc. of content, content transfer request handling unit 22 stored in the pre-encapsulation content storage unit 25, and metadata stored in the pre-encapsulation content storage unit 25 The log reading unit 26 that reads data records and the content storage unit 25 before encapsulation are stored. A content encapsulated execution unit 27 for executing the encapsulation of content and metadata are, and a content transmission unit 29 for transmitting the encapsulated content with metadata in the content terminal 4.

  Here, as proposed in Patent Document 1, the content capsule execution unit 27 adds content ID (identification number) information to content stored in the pre-encapsulation content storage unit 25 by the metadata adding unit 27B. In addition to adding metadata such as author information, the encoding unit 27A uses a method such as encryption of at least part of the content and digital watermarking of the content by an encryption method that can be restored by a predetermined reproduction application. Tampering is prevented and a capsule is formed in which these are incorporated as an integral part.

  The log reading unit (content distribution log) 3 extracts the metadata stored in the pre-encapsulation content storage unit 25 in order to check the alteration of the metadata describing the detailed information of the content before and after being encapsulated. It has a function. The metadata stored here is accumulated in the distribution metadata management database 8.

  Next, the configuration of the content use terminal 4 and the content distribution log 5 will be described with reference to FIG.

  The content usage terminal 4 has a metadata editing unit 41 that creates search information 42 and a metadata search request unit 43 that transmits a content request packet to the content transmission terminal 2 in order to request usage content from the content transmission terminal 2. is doing. The encapsulated content 30 with metadata sent from the content sending terminal 2 that has received the content request packet and performed the above-described operation passes through the content receiving unit 44 and reaches the content using terminal 4. The content use terminal 4 obtains a common key by giving user information or the like when the content transmission terminal 2 requests to reproduce the encapsulated content. The content use terminal 4 can audition the content using the dedicated browser 45. Here, the content distribution log 5 reads the search metadata attached to the acquired content and the content description metadata describing the content, and a distribution metadata management database having a distribution content log monitoring function 8 accumulates.

  Next, the configuration of the monitoring-required metadata management terminal 6 will be described with reference to FIG.

  The monitoring metadata management terminal 6 required is created by a distribution metadata management database 8 for storing metadata extracted from the content transmission terminal 2 and the content use terminal 4, and an application from the copyright organization or the author himself. A data acquisition unit 61 that acquires copyrighted material data from the copyright protection database 9, a conversion unit 62 that converts the acquired data (eg, Hyper Text Markup Language (HTML) → CSV), and the converted copyrighted material data The monitoring-required metadata list 63 to be stored, the fraud management database 66 that manages reports from other terminals in the network, the comparison unit 64 that collates the data in the monitored metadata list 63 and the fraud management database 66, and And a display unit 65 that issues a comparison result to the patrol monitoring terminal 7. The reports managed by the fraud management database 66 include content in the case where the search information and the acquired content do not match, the search information, content that may cause copyright infringement, and the search information. What is included in the monitoring-required metadata is extracted from the top of the distributed metadata, etc., so that the patrol monitoring terminal 7 transmits the metadata and receives the content to check for copyright infringement. Investigate. The network administrator monitors the traffic volume, identifies the terminal that is abnormally uploading or downloading, and extracts the metadata sent and received from that terminal. The data is stored in a fraud management database 66 provided in the monitoring required metadata management terminal 6. The comparison unit 64 collates the records in the fraud management database 66 and determines the monitoring targets in descending order of matching.

  Next, the configuration of the tour monitoring terminal 7 will be described with reference to FIG.

  The patrol monitoring terminal 7 transmits the monitoring required search information determined by the monitoring metadata management terminal 6 to the mobile terminal 72, the mobile terminal 72 for acquiring content based on the search information, It has a receiving unit 73 that receives content and search information from the terminal 72, and a distribution stop command unit 74 that checks the content and determines whether distribution can be stopped. The fraud that can be understood by checking the content means that the content entity and the metadata of the search information do not match. Therefore, by receiving the content and confirming the contents (content and content description metadata) and the search information externally attached, it is possible to confirm the mismatch of the metadata. It can also be seen from the substance whether the content is in violation of copyright.

  The 囮 terminal 72 actually transmits search information to the monitoring-required terminal by using the metadata that may be illegal content selected by the monitoring-required metadata management database 6 described above.

  囮 terminal 72 is capable of executing the above-mentioned program at a patrol destination, acquires the content, and works as a spyware that knows information such as a sender IP address, a user ID, a sender terminal ID, a capsule name, and a content ID. It is possible to track a terminal that is sending illegal content to the network.

The heel terminal 72 reads the content of the capsule hit by the search by the browser, and browses and executes the content as in the case of a normal content use terminal.
The patrol monitoring terminal 7 receives the search information and the content that are monitored from the bag terminal 72. The receiving unit 73 detects that the content transmission terminal 2 has falsified the information when the search information and the content description metadata do not match, or when the content and the search information do not match. In addition, the distribution stop command unit 74 determines whether or not fraudulent acts are possible, notifies the peer that transmitted the content of the warning, and allows the terminal and the content to be clearly suspected of violating copyright law. , To make it possible to control the suspicious metadata from being registered at the search stage.

  In this way, in order to realize illegal monitoring of files distributed on the network, the distributed metadata is managed by a conventional mechanism that protects copyright when distributing contents, such as Patent Document 1. In addition, it is possible to track a terminal that has registered illegal content, and the fact that a patrol supervisor actually discovers fraud by performing transmission / reception in the network and enables suspension of distribution.

  Next, the operation of this embodiment will be described with reference to FIG. The content transmission terminal 2 creates a capsule of the content and content description metadata partially or entirely encrypted, adds search information distributed in the network 1 at the search stage, and distributes it to the content use terminal 4 (Step 101). The content distribution log in the content transmission terminal 2 extracts the content description metadata of the generated content and stores it in the distribution metadata management database 8 (step 102). The content use terminal 4 decrypts the capsule by the browser 5 with respect to the search information and the encapsulated content hit in the network 1, and reads the content of the capsule to be viewed or executed (step 103). The content distribution log in the content use terminal 4 extracts the metadata of the search information of the acquired content and stores it in the distribution metadata management database 8 (step 104). The distribution metadata management database 8 stores search information related to the content at the search stage and the transmission stage, and content description metadata, and collectively manages the metadata distributed in the network 1 (step 105). The monitoring metadata management terminal 6 that requires monitoring collates the information in the distribution metadata management database 8 with the information in the copyrighted work database 9, and the search information for the same content does not match the content description metadata. The possible metadata is extracted and collated with the record in the fraud management DB 66 to determine the metadata that needs to be monitored (step 106). The patrol monitoring terminal 7 transmits the metadata that needs to be monitored in the distribution metadata management database 8 to the network (step 107).

  In addition to the content transmission terminal, content use terminal, monitoring metadata management terminal, and patrol monitoring terminal realized by dedicated hardware, a program for realizing the function is stored on a computer-readable recording medium. The program recorded and recorded on this recording medium may be read into a computer system and executed. The computer-readable recording medium refers to a recording medium such as a flexible disk, a magneto-optical disk, and a CD-ROM, and a storage device such as a hard disk device built in a computer system. Furthermore, a computer-readable recording medium is a server that dynamically holds a program (transmission medium or transmission wave) for a short period of time, as in the case of transmitting a program via the Internet, and a server in that case. Some of them hold programs for a certain period of time, such as volatile memory inside computer systems.

1 is a block diagram illustrating an overall configuration of a content distribution system according to an embodiment of the present invention. It is a figure which shows the distribution route of the metadata in the system shown in FIG. It is a block diagram which shows the structure of the content transmission terminal in the system shown in FIG. It is a block diagram which shows the structure of the content utilization terminal in the system shown in FIG. It is a block diagram which shows the structure of the monitoring metadata management terminal required in the system shown in FIG. It is a block diagram which shows the structure of the patrol monitoring terminal in the system shown in FIG. It is a sequence diagram which shows operation | movement of the system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Network 2 Content transmission terminal 4 Content utilization terminal 6 Monitoring required metadata management terminal 7 Travel monitoring terminal 8 Distribution metadata management database 9 Copyright protection database 20 Collection of search information 21 Metadata search response part 22 Content transfer request response part 23 Content 24 Metadata 25 Pre-encapsulation content storage unit 26 Log reading unit 27 Encapsulation execution unit 27A Encoding unit 27B Metadata addition unit 28 Content transmission unit 29 Encapsulated content with metadata 41 Metadata editing unit 42 Search information 43 Meta Data search request part 44 Content reception part 45 Dedicated browser 61 Metadata acquisition part 62 Conversion part 63 Monitoring metadata list 64 Comparison part 65 Display part 66 Fraud management database 71 Transmission part 72 囮 terminal 73 Receiver 74 Distribution Stop Command Unit 101-107 Steps

Claims (12)

A fraud monitoring method in a content distribution system having a content transmitting terminal, a content using terminal, and a network connecting them,
In the content use terminal, the consistency between the content description metadata describing the content of the content in the capsule at least partially encrypted with the encryption that can be decrypted by a predetermined browser and the search information is ensured. Therefore, there is a monitoring metadata management terminal with a distribution metadata management database that performs batch management of the distributed metadata, and fraud including copyright infringement and tampering is performed from the distributed metadata. A meta-monitoring terminal that extracts meta data that may be present and monitors the network as if it were a remote terminal, and installed in the network,
The content transmission terminal creates a capsule of the content and the content description metadata partially or entirely encrypted, adds search information distributed in the network at the search stage, and distributes it to the content use terminal ,
The content distribution log in the content transmission terminal extracts the content description metadata of the generated content, stores it in the distribution metadata management database,
The content use terminal decrypts the capsule by the browser for the search information and the encapsulated content hit in the network, reads the content of the capsule to be viewed or executed,
The content distribution log in the content use terminal extracts the metadata of the search information of the acquired content, stores it in the distribution metadata management database,
The distribution metadata management database stores the search information regarding the content at the search stage and the transmission stage and the content description metadata, and collectively manages the metadata distributed in the network,
The monitoring metadata management terminal that requires monitoring collates information in the distribution metadata management database with information in the copyrighted work database, and extracts metadata that may be fraudulent,
The monitoring-required metadata management terminal determines the metadata that needs monitoring from the extracted metadata,
The patrol monitoring terminal transmits the metadata that needs to be monitored in the distribution metadata management database to the network.
Fraud monitoring method in content distribution system.   When a content creator issues a request to encapsulate content and metadata describing the content, the content distribution log stores the content description metadata before content distribution, while the content user When the content is received and the encapsulated content is decrypted, the content distribution log stores the search information after the content distribution, and the distribution metadata management database collectively manages the metadata distributed in the network The fraud monitoring method according to claim 1, wherein:   The fraud monitoring method according to claim 1 or 2, wherein the distribution metadata management database confirms the match between the search information for the same content and the content description metadata, and issues a warning to the terminal if they do not match.   The fraud monitoring method according to any one of claims 1 to 3, wherein the monitoring-required metadata management terminal manages literary work data and metadata distributed in the network and determines the necessity of monitoring.   The fraud monitoring method according to any one of claims 1 to 4, wherein the patrol monitoring terminal acquires content using monitoring-required metadata and discovers fraud in the network.   When the patrol monitoring terminal finds fraud, the patrol monitoring terminal issues a warning to the content transmitting terminal and the content owning terminal, and makes it impossible to register the search information in the network so that the fraudulent content cannot be found at the search stage. The fraud monitoring method according to any one of claims 1 to 5. In a content distribution system having a content transmitting terminal, a content using terminal, and a network connecting them,
In the content use terminal, content description metadata describing the content of the content in a capsule that is encrypted at least partially by a cipher that can be decrypted by a predetermined browser, and search in the search stage and transmission stage In order to ensure the consistency of information, it has a distribution metadata management database that collectively manages the metadata distributed in the network, and the information in the distribution metadata management database, the information in the copyrighted work database, , And a monitoring-required metadata management terminal that extracts metadata that may be fraudulent,
The metadata that needs to be monitored is determined from the extracted metadata, is monitored by a terminal in the network, and the metadata that needs to be monitored in the distribution metadata management database is stored in the network. And a patrol monitoring terminal for sending,
The content transmission terminal creates a capsule of the content and the content description metadata partially or wholly encrypted, adds search information distributed in the network at the search stage, and distributes it to the content use terminal A content distribution log for extracting the content description metadata of the generated content and storing it in the distribution metadata management database;
Means for allowing the content using terminal to decrypt the capsule by the browser with respect to the search information and encapsulated content hit in the network, reading the content of the capsule, viewing or executing the content, and meta information of the search information of the acquired content A content distribution system further comprising a content distribution log for extracting data and storing the data in the distribution metadata management database. A metadata search response unit that performs a search based on a set of search information from a content use terminal;
A content transfer request handling unit that requests to transmit the optimum content from among the content held by the user;
A pre-encapsulation content storage unit;
A log reading unit that extracts metadata stored in the pre-encapsulation content storage unit and accumulates it in a distribution metadata management database;
A content encapsulation execution unit that performs encapsulation of content and metadata stored in the pre-encapsulation content storage unit;
A content transmission terminal comprising: a content transmission unit that transmits the encapsulated content with metadata to the content use terminal. A metadata editor for creating search information;
A metadata search request unit for transmitting a content request packet to a content transmission terminal;
A content receiver that receives the encapsulated content with metadata sent from the content transmitting terminal;
A dedicated browser for playing the encapsulated content;
A content distribution log that reads the search metadata attached to the encapsulated content and the content description metadata describing the content of the content, and accumulates it in a distribution metadata management database having a distribution content log monitoring function A content use terminal having and. A distribution metadata management database for storing metadata extracted from the content transmitting terminal and the content using terminal;
A data acquisition unit for acquiring copyrighted material data;
A conversion unit for converting the acquired data;
A monitoring metadata list that stores the converted copyrighted work data,
A fraud management database that manages reports from other devices in the network,
A comparison unit that collates data in the fraud management database with data in the monitoring-required metadata list;
Based on the result of the comparison in the comparison unit, a search command for a patrol monitoring terminal that extracts metadata that may be fraudulent, including copyright infringement and falsification, from the metadata in circulation And a monitoring metadata management terminal having a display unit that issues a stop command when unauthorized content is found. A 囮 terminal that acquires content based on monitoring search information required;
A transmission unit for transmitting monitoring search information determined by the monitoring metadata management terminal to the terminal,
A receiving unit for receiving content and search information from the terminal;
A circulation monitoring terminal comprising: a distribution stop instruction unit that checks the content and determines whether distribution can be stopped.   The program for making a computer perform the function of the terminal in any one of Claims 8-11.

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