JP2003216503A - Data communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a benefit of a copyright holder by allowing a proper holder alone to reproduce contents. <P>SOLUTION: This data communication system receives contents data D comprising a header part H and a contents part C and storing a user ID, or the holder of a contents part C, from another terminal device 30, stores them in a memory 33, transmits the header part H out of the contents data D stored in the memory 33 to a sever device 10, receives the transmitted header part H, updates the user ID, or a former holder of the received header part H, to a user ID of a new holder, transmits the updated header part H to the terminal device 30, receives the transmitted header part H, and allows the reproduction of the contents part C of the contents data D having the updated header part H, only when the header part H is updated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system and method for permitting reproduction of contents only to a legitimate owner who paid the price, a data communication device and method constituting this system, a recording medium and a computer. Regarding the program.

[0002]

2. Description of the Related Art Conventionally, content data such as music data, movie data and game software is recorded on a recording medium such as an optical disk and distributed from content providers such as record companies, movie companies and game makers. In addition, such content data is recorded in EMD (Electronic Music).
Distribution) etc. is distributed from the content provider via a network.

[0003] In addition, the user who purchased the content
It has become widespread by transferring the recording medium in which the content is copied to a friend or the like, or by transmitting the file of the content to a terminal device of the friend or the like via a network.

[0004]

However, when the recording medium on which the content is copied is transferred, the transferor needs to deliver it to the transferee, which is inconvenient as compared with EMD. On the other hand, music data, movie data, game software, etc. have a large data size, and when transmitting these data via a network, it takes too much communication time and also a heavy load on the server device. I will end up.

[0005] In addition, content exchange between friends and the like may be performed without permission of the copyright holder of the content, and in such a case, the profit of the copyright holder may be unjustly harmed. become.

The present invention has been made in view of the above problems, and the purpose thereof is to permit the reproduction of contents only by the legitimate owner and protect the interests of the copyright holder. A data communication system and method are provided.

Another object of the present invention is to provide a data communication system and method which can return profits to users who cooperated in the dissemination of contents and disseminate the contents efficiently.

A further object of the present invention is to provide a data communication system and method which can reduce the load on the server by reducing the amount of contents exchanged through the network.

Still another object of the present invention is to provide a data communication device and method used in the above system method.

Still another object of the present invention is to provide a recording medium having a computer program recorded thereon and a computer program capable of achieving the above object.

[0011]

In order to solve the above-mentioned problems, a data communication system according to the present invention comprises a header section and a content section from another terminal device, and the header section identifies at least the owner of the content section. First receiving means for receiving the content data in which the data is stored, first transmitting means for transmitting the header part of the content data received by the first receiving means, and the first transmitting means. A second receiving means for receiving the header portion; an updating means for updating the owner identification data of the header portion received by the second receiving means to new owner identification data; and a header portion updated by the updating means. Second transmitting means for transmitting to the first receiving means, reproducing means for reproducing the content data having the updated header portion received by the first receiving means, and content in the reproducing means. The reproduction of data, and a permitting means for permitting only when the header is updated by the update unit.

A data communication method using this system is as follows:
From another terminal device, the content data having the header part and the content part, in which at least the owner identification data of the content part is stored, is received, stored in the storage means, and the content data of the content data stored in the storage means is received. Of these, the header section is transmitted, the transmitted header section is received, the owner identification data of the received header section is updated to new owner identification data, the updated header section is transmitted, and the transmitted header section is transmitted. Section is received, and the content data having the updated header section is reproduced only when the header section is updated.

Further, the data communication device used in this system receives the content data transmitted from the other terminal device and having the header part and the content part and at least the owner identification data of the content part being stored in the header part. A receiving unit for receiving the header section transmitted from the terminal device; an updating section for updating the owner identification data of the header section received by the receiving section to new owner identification data; and a header section updated by the updating section. And a transmitting means for transmitting to the terminal device.

A data communication method using this data communication device receives content data transmitted from another terminal device and having a header part and a content part and at least the owner identification data of the content part being stored in the header part. The header part transmitted from the terminal device is received, the owner identification data of the received header part is updated to new owner identification data, and the updated header part is transmitted to the terminal device.

Further, the recording medium according to the present invention has a computer program recorded thereon which can be executed by a computer. Then, the computer program according to the present invention is composed of a header part transmitted from another terminal device and a content part, and from the terminal device receiving the content data in which at least the owner identification data of the content part is stored in the header part. The method includes the steps of receiving the transmitted header section, updating the owner identification data of the received header section with new owner identification data, and transmitting the updated header section to the terminal device.

Furthermore, the data communication device used in this system is composed of a header part and a content part, and transmits the content data in which at least the owner identification data of the content part is stored to the other terminal device. The transmitting means, the first receiving means for receiving the content data transmitted by the first transmitting means of the other terminal device, and the header portion of the content data received by the first receiving means are transmitted to the management device. Second transmission means, second reception means for receiving the header section whose owner identification data has been updated by the management device, and reproduction of content data having the updated header section received by the second reception means. The reproducing unit includes a reproducing unit and a permitting unit that permits the reproducing unit to reproduce the content data only when the header unit is updated by the management device.

In addition, the data communication method using this data communication device uses the content data transmitted from another terminal device and including the header part and the content part, in which at least the owner identification data of the content part is stored in the content data. The header part of the received content data is transmitted to the management device, the header part in which the owner identification data is updated in the management device is received, and the header part is updated only when the header part is updated. The content data having the header part is reproduced.

Further, the recording medium according to the present invention has a computer program recorded thereon which can be executed by a computer. Then, the computer program according to the present invention includes a step of receiving content data in which at least the owner identification data of the content part is stored, which is composed of a header part and a content part transmitted from another terminal device, The step of transmitting the header part of the received content data to the management device, and the step of transmitting the header part in which the owner identification data has been updated by the management device, and the updated header part only when the header part has been updated. Reproducing content data having a copy.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A data communication system to which the present invention is applied will be described below with reference to the drawings.

As shown in FIG. 1, a data communication system 1 to which the present invention is applied has a server device 10 in which a database of users who have registered and participated in a game operated by the system is built, and accesses the server device 10. And a terminal device 30 for downloading the content data. These devices are ISDN (Integrated Services Di
gital Network) line, CATV (Cable Television)
Line, optical cable line, xDSL (x Digital Subscrib
er line), a satellite line for digital satellite broadcasting, and the like, and is connected via TCP / IP (Tran
smission Control Protocol / Internet Protocol), FT
Data is exchanged according to a transmission protocol such as P (File Transfer Protocol). Also,
The server device 10 is connected to the settlement center 4 via a dedicated line, and when the user participates in the game, the server device 10 can perform a billing process and transmit billing data to the settlement center. Moreover, between the terminal devices 30, it is possible to transmit or receive content data such as music data, movie data, game software or the like by wire or wirelessly. For example, USB (Universal s
erial bus), IEEE (Institute of Electrical and
Electronic Engineers) 1394, Bluetooth (Bl
uetooth), IrDA (Infrared Data A) that uses infrared rays
(ssociation), IEEE802.11a / b, etc., so that content data can be transmitted and received. Of course, the content data may be exchanged not only via the network 2 but also via the removable recording medium 3.

In the data communication system 1 as described above,
The user who has registered as a user in this system is the server device 1
Content data stored in 0 can be downloaded for a fee. And the user
This downloaded content data can be sent to other users by wire or wirelessly or by the removable recording medium 3
The content data copied using can be transferred. The user who has received the content data accesses the terminal device 30 via the terminal device 30, pays the price, and rewrites the name of the transferred content data to his / her own name, thereby reproducing the content data on his / her terminal device 30. be able to. Further, since the user who is the transferor contributes to the distribution of the content data, the user can receive benefits such as consideration and discount corresponding to the distribution. As described above, in the data communication system 1 to which the present invention is applied, it is possible to efficiently disseminate content data among users while protecting the interests of the rights holders related to the content such as the copyright holder of the content data. It is like this. Hereinafter, details of the data communication system 1 will be described with reference to the drawings.

First, in the present system 1, a data format when data is exchanged between the server device 10 and the terminal device 30 and between the terminal devices 30 is shown in FIG.
Will be described with reference to. The content data D is composed of a header section H and a content section C. The header section H includes a header length, a content ID for identifying data in the content section C, and a right holder ID for identifying a right holder such as a copyright holder related to the content of the content section C. Resale information indicating the number of times the content data D can be transferred between users, standard price information paid by the user to the administrator of the server device 10 when the user downloads the content data on the terminal device 30,
Right holder distribution ratio indicating the distribution ratio to the right holder, distributor distribution ratio indicating the distribution ratio paid to the user who resells the content data, the content key for encrypting the data of the content section C, and the current content data. User ID for identifying the owner of the header, the distributor ID for identifying the owner in the past, the padding in which the padding data is stored in the rest of the header part H, and the tampering of the header part H is detected. And a CRC (Cyclic Redundancy Check).

The right holder ID is attached to the artist name, lyricist name, composer name, arranger name, etc., respectively. Each right holder ID is associated with a right holder distribution ratio, and each right holder distribution ratio stores a distribution ratio of consideration paid by the user. Further, the distributor ID stores the user ID of the transferor who transferred the content data D or a copy thereof to a friend or the like. In the present system 1, the transferee can further transfer to a friend or the like, so that the distributor ID can be stored in the header portion H for the number of times of transfer or the like stored in the resale information. ing. A distributor distribution rate is associated with each distributor ID. In other words, the header portion H is configured so that the history of the owner of the content can be known, and each distributor receives a benefit such as a reduction according to the distributor distribution rate as a contribution to the spread of the content. You can do it. In this way, in the present system 1, the consideration from the user is distributed to the administrator, the rightful person, and the distributor of the present system 1.

Content ID, right holder ID, user ID
And CRC are encrypted with an application key (hereinafter, referred to as an APL key) that is commonly owned by the server device 10 and the terminal device 30. The content key is encrypted using the user ID, and the content section C is encrypted using the content key as the encryption key. Of course, when encrypting the content section C, a content ID, which is content identification data, may be used instead of the content key. These encryption methods are, for example, DES (Data Encryption
Standard). In the header part H, each item is composed of 8 bytes, and the CRC stores a value obtained by calculating a CRC for all data in the header part H. CRC
Can detect whether the header part H has been tampered with by recalculating the CRC at the time of reproduction. In addition to CRC, MAC (message authentication code) and MDC can be used as a method of detecting this tampering.
(Manipulation / modification detection code). In addition, the content section C stores the compressed content, and additionally stores supplementary information such as the title of the stored content.

The content data D constructed in this way
By encrypting the content section C with the content key and further encrypting the content key with the user ID, it is possible to prevent the content data from being illegally reproduced by the user who acquired the content data. ing. Further, by storing the CRC in the header part H, it is possible to detect whether or not the header part H has been tampered with. Then, when the terminal device 30 downloads from the server device 10 or the terminal device 3
When transmitting and receiving between 0, the content data D is in such a format, and when the transferee accesses the server device 10 to reproduce the content data, only the header part H is transmitted from the terminal device 30. The terminal device 30 receives the updated header portion H transmitted to the server device 10.

Next, the server device 10 that constitutes the system 1 is a device owned by a content provider such as a record company, a movie company, or a game maker that operates the system 1, and as shown in FIG. , A reception unit 1 for receiving data transmitted from the terminal device 30 via the network 2.
1, a transmission unit 12 that transmits data to the terminal device 30 via the network 2, an encryption / decryption unit 13 that decrypts the encryption of the data transmitted from the terminal device 30, and the terminal device 3
Extractor 14 for extracting identification data from the data transmitted from 0, an accumulator 15 in which content data is accumulated and a database is constructed, and an accumulator 15
A search / update unit 16 for searching and updating the data, an encryption unit 17 for encrypting the data to be transmitted to the terminal device 30, an APL key used for encrypting a part of the header part H, and a content part C. An encryption key holding unit 18 in which a content key used for encryption is stored.

Upon receiving the header section H transmitted from the terminal device 30, the encryption / decryption section 13 receives the AP
Content I encrypted with DES using L key
Decrypt D, Rightholder ID, User ID and CRC. The extraction unit 14 extracts the user ID from the plain text header portion H, and outputs the user ID to the search update unit 16 when searching the database of the storage unit 15.

The storage unit 15 is, for example, a large-capacity hard disk built in the main body of the apparatus, in which a plurality of content data D provided for this service are stored.
In addition, a database for managing data necessary for operating the system 1 is built in the storage unit 15. This database is a user registration management record for managing users who have registered with the system 1, a user point management record for managing points of registered users, and a rights holder management for managing points of content right holders. It is composed of records.

The search update unit 16 accesses the storage unit 15 to search and extract necessary data. For example, when there is a request for downloading the content data D from the terminal device 30, the search update unit 16 searches for and reads the corresponding content data D. Further, when there is a user registration application, the search update unit 16 generates the user ID of the user and registers it in the database. Also, the search update unit 16
When one of the users resells the content data D to another user, the user ID configuring the header part H of the content data D is updated to that of the other user.

The encryption unit 17 transfers the content data D corresponding to the download request from the terminal device 30 to the terminal device 3
When transmitting to 0, the content part C is encrypted with the content key, and this content key is encrypted with the user ID. The encryption unit 17 also uses the APL key to encrypt the content ID, the right holder ID, the user ID, and the CRC.

The encryption key holding unit 18 stores an APL key and a content key. The APL key and / or the content key are distributed and stored in, for example, an application program, and are reproduced in the memory by performing calculation and conversion. Of course, in addition to this, the APL key and / or the content key may be stored in a memory element that is difficult to analyze. The APL key is read by the encryption / decryption unit 13 when decrypting the encryption of the header portion H, and is read by the encryption unit 17 when encrypting the header portion H. In addition, the content key is an encryption unit 17 for encrypting the content section C when the content data D is transmitted to the terminal device 30.
Read out.

The server device 10 as described above has a configuration similar to that of an ordinary computer, and realizes the functions shown in FIG. 3 by installing an application program having the above functions. be able to. The hardware configuration of the server device 10 will be described with reference to FIG.
Via a CPU (Central Processing Unit) 22,
RAM (Random Access Memory) 23, network controller 24, IDE (Integrated DriveElectr)
onics) controller 25, and hard disk 26 is connected to IDE controller 25. The hard disk 26 stores an operating system, a transmission protocol, an application program for realizing the functions of the server device 10, a database, content data used for this service, and the like. The CPU 22 loads a necessary program into the RAM 23 and executes processing. Then, the CPU 22
When communicating with the terminal device 30, the transmission protocol stored in the hard disk 26 is executed, and the transmitting / receiving unit 1
Data communication is performed via the network controller 24 forming the units 1 and 12.

The terminal device 30 that accesses the server device 10 via the network 2 is installed in, for example, a user's house, and as shown in FIG. A transmission unit 31, a reception unit 32 that receives data transmitted from the server device 10 via the network 2, a memory 33 that stores the content data D and the like downloaded from the server device 10, and a read from the memory 33. Header extraction unit 34 for extracting the header part H from the content data D
An encryption / decryption unit 35 for decrypting the content key in the header part H and the encryption of the content part C, an encryption key holding unit 36 for holding the APL key, and a determination unit 37 for determining the user ID in the header H. , A reproduction processing unit 38 that performs reproduction processing on the plaintext content portion C, a speaker 39 and a monitor 40 that output the reproduction-processed data, a mounting unit 41 on which the removable recording medium 3 is mounted, and a terminal. An inter-terminal communication unit 42 for exchanging content data D between the devices 30 and an operation unit 43 for inputting operation signals for executing the functions of the devices are provided.

The memory 33 is a hard disk built in the main body of the apparatus or an optical disk detachable from the main body of the apparatus.
It is a removable recording medium such as a magneto-optical disk, a magnetic disk, an IC card, etc., in which an operating system, a transmission protocol, various application programs, and content data downloaded from the server device 10 are stored.

The header extraction unit 34 determines the content data D
When reproducing, the header section H is extracted, and the extracted header section H is output to the encryption / decryption section 35. Further, the header extraction unit 34 extracts the header unit H to update the user ID when the content data D transmitted from the other terminal device 30 is first reproduced, and outputs the header unit H to the transmission unit 31.

The encryption / decryption unit 35 uses the content data D
When reproducing, the user ID is decrypted by using the APL key, and the plaintext user ID is output to the determination unit 37. Also, the encryption / decryption unit 35 decrypts the content key in the header portion H using the decrypted user ID, decrypts the encryption of the content portion C using the decrypted content key, and the plaintext content The section C is output to the reproduction processing section 38.

The encryption key holding unit 36 stores the APL key in a distributed manner, for example, in an application program, and is reproduced in the memory by performing calculation and conversion. Of course, in addition to this, the APL key may be stored in a memory element that is difficult to analyze, or may be downloaded from the server device 10 and acquired. The APL key is read by the encryption / decryption unit 35 when decrypting the encryption such as the user ID.

The discriminator 37 compares the user ID stored in the header portion H of the content data D to be reproduced with the user ID stored in the memory of the device. Further, the determination unit 37 compares the CRC value included in the header portion H with the CRC value recalculated in the header portion H to be reproduced. Then, when the user ID held by the device and the user ID included in the header portion H of the content data D match and the CRC values match, the determination unit 37 determines the encryption / decryption unit 35.
Then, the encryption of the content key is decrypted using the user ID, and the encryption of the content section C is decrypted using the plain-text content key.

The reproduction processing unit 38 uses the ATRAC3 (Adapti
ve Transform Acoustic Coding 3: Trademark) is used to decompress data that has been compressed. In addition to this, the compression format is MPEG-2 AAC (Motion Pic).
ture Expert Group 2 Advanced Audio Coding: trademark, MP3 (MPEG-1 Audio Layer3: trademark), Twi
nVQ (Transform-Domain Weighted Interleave Vecto
r Quantization: trademark, MS Audio (WMA: W
indows Media Audio (trademark), Ogg Vorbis
(Trademark) or the like. Next, for example, the reproduction processing unit 38 converts the decompressed data from a digital signal to an analog signal by the D / A converter, and the speaker 3
9, CRT (Casord Ray Tube), LCD (Liquid Crys)
output to a monitor 40 such as a tal display). Note that the speaker may be an earphone, headphones, or the like.

The mounting portion 41 includes a magneto-optical disk, a read-only optical disk on which data is recorded by transferring a pit pattern composed of unevenness of a stamper, a write-once optical disk using a dye material as a recording layer, and a phase change material. Rewritable optical disk used for recording layer, magnetic disk, disk cartridge using these disks as recording media, tape cassette using magnetic tape as recording medium, removable recording medium 3 such as IC card using semiconductor memory as recording medium
Is installed. Content data D copied by, for example, another terminal device 30 is recorded on the removable recording medium 3. By mounting this removable recording medium 3, the content data D stored on the removable recording medium 3 is stored in a memory. It can be copied to 33. Furthermore, when the removable recording medium 3 is a read-only optical disc, the optical disc can be distributed by a publisher or the like to copy the recorded content data D. Further, when the terminal device 30 is a personal computer, the removable recording medium 3 in which the application program necessary for using the present system 1 is stored is mounted in the mounting portion 41, so that the application program is installed in the memory 33. can do.

The inter-terminal communication section 42 can exchange the content data D with another terminal device 30 by wire or wirelessly. Specifically, the inter-terminal communication unit 42 uses the US
B, IEEE 1394, Bluetooth, IrDA using infrared rays, IEEE 802.11a / b, and other interfaces are provided. Then, the inter-terminal communication unit 42
The content data D transmitted from another terminal device 30 is received by wire or wirelessly, and this is stored in the memory 33,
Further, the content data D stored in its own memory 33 can be transmitted to another terminal device 30. That is, the inter-terminal communication unit 42 enables the content data D to be exchanged between the terminal devices 30.

The operation section 43 is for inputting an operation signal to the main body of the apparatus, and is a keyboard, a numeric keypad, a mouse, a trackball, a joystick, a remote operation apparatus or the like. In the operation unit 43, when the content data D is downloaded from the server device 10, selection operation of the content data D to be downloaded, reception or transmission operation, character input operation, etc. can be performed.

The terminal device 30 as described above has substantially the same configuration as a normal personal computer, and realizes the functions shown in FIG. 5 by installing the application program having the above functions. can do. The hardware configuration of the terminal device 30 will be described with reference to FIG. 6. A CPU 52, a RAM 53, an IDE controller 54, a network controller 56, a video controller 57, and a sound controller 58 via a system bus 51.
And the input controller 59 are connected. IDE
A hard disk 55 is connected to the controller 54, a monitor 40 is connected to the video controller 57, a speaker 40 is connected to the sound controller 58, and an operation unit 43 is connected to the input controller 59. The hard disk 55 stores an operating system, a transmission protocol, an application program for realizing the functions of the terminal device 30, and the like. The CPU 52 loads a necessary program into the RAM 53 and executes a process according to an input from the operation unit 43. When communicating with the server device 10, the CPU 52 executes the transmission protocol stored in the hard disk 55, and performs data communication via the network controller 56 that constitutes the transmitting / receiving units 31 and 32.

Next, a procedure for a user to install an application program required for the system 1 on the terminal device 30 when using the system 1 will be described with reference to FIG.

First, in step S1, the user
A removable recording medium in which an application program necessary for using the system 1 is recorded is attached to the attachment unit 41 of the terminal device 30, and the user operates the operation unit 43.
When the operation of starting the installation is performed using the terminal device 30, the terminal device 30 reads the application program from the removable recording medium mounted in the mounting portion 41, and the memory 3
Start the operation of installing to 3. In step S2, the terminal device 30 transmits a communication start request for starting communication with the server device 10 via the network 2 according to the application program to be installed, by the transmission unit 3.
1 to the server device 10. In step S3, the server device 10 in the reception standby state is in step S3.
In 4, when the communication start request transmitted from the terminal device 30 is received, communication with the terminal device 30 is started. At the same time, when the terminal device 30 also receives the confirmation signal from the server device 10, in step S5, the server device 1
Start communication with 0.

In step S6, the server device 10
Requests the settlement information to confirm the payment method and the like when the content data D is downloaded.
Send to. In step S7, the terminal device 30
When the receiving unit 32 receives the request for the payment information transmitted from the server device 10, the monitor 40 displays an input screen necessary for inputting the payment information, for example. Then, the user operates the operation unit 43 to input the adjustment information to the terminal device 30. This settlement information is data for making a payment, and includes a user's account number, credit number, personal identification number, and the like. Then, the terminal device 30
When the input of the account information by the user is completed and a transmission signal is input from the operation unit 43, the transmission unit 31 transmits the settlement information to the server device 10 in step S8.

In step S9, the server device 10
When the receiving unit 11 receives the payment information, the search updating unit 16 of the server device 10 then receives the payment information in step S10.
Generates a new user ID that does not overlap with the already generated user ID, and registers the user ID in the user point management record of the storage unit 15 in step S11.

[0048]

[Table 1]

As shown in Table 1 above, the user point management record for managing the points of registered users has user IDs, user payment points, and settlement account information as fields. When registering a new user, the search update unit 16 registers a user ID and settlement account information in this user point management record, and inputs 0, which is an initial value, as a user payment point.
As for this user payment point, the registered user can use this system 1
It shows the amount of money to be paid to the manager, and 1 point is converted into 1 yen, for example.

In step S12, the server device 10
The encryption unit 17 reads the APL key from the encryption key holding unit 18, and uses this APL key to encrypt the user ID generated in the search update unit 16. In step S13, the server device 10 transmits the user ID encrypted by the encryption unit 17 from the transmission unit 12 to the terminal device 30.

In step S14, the terminal device 30 in the reception standby state receives the encrypted user ID in the reception unit 32.
When it is received by, the encrypted user ID is stored in the memory 33. Then, in step S15, the terminal device 30 transmits an installation completion signal, which indicates that the installation of the application program required for the system 1 is completed, to the server device 10 from the transmission unit 31, and in step S16, the server device 10 is performed. End communication with. Further, the server device 10 includes the receiving unit 11
When the installation completion signal transmitted from the terminal device 30 is received by the receiving unit 32, the communication with the terminal device 30 ends.

Thus, the terminal device 30 stores the application program necessary for the present system 1 and stores the user ID generated in the server device 10 in an encrypted state.
The desired content data D can be downloaded from, and the downloaded content data D can be reproduced.

Next, with reference to FIG. 8, description will be given of a procedure of downloading the content data D desired by the user by the terminal device 30 in which the application program required for the system 1 is installed as described above.

First, in step S21, when the user performs a user ID transmission operation on the operation unit 43 in the terminal device 30, the user I in the state of being encrypted with the APL key.
D is read from the memory 33, and the read encrypted user ID is transmitted from the transmission unit 31 to the server device 10. Server device 1 in the reception standby state in step S22
In step S23, 0 receives the encrypted user ID transmitted from the terminal device 30 by the receiving unit 11, and decrypts the encrypted user ID by the encryption / decryption unit 13. That is, the encryption / decryption unit 13 uses the encryption key holding unit 18 to access the AP
Read the L key and use this APL key to create a user ID
Decrypt the code.

In step S24, the server device 10
The search and update unit 16 of uses the plaintext user ID as a keyword to access the user point management record of the database built in the storage unit 15, and
User payment points of, then step S2
At 5, the user payment points are transmitted to the terminal device 30. In step S26, the terminal device 30
When the receiving unit 32 receives the user payment points transmitted from the server device 10, the user payment points are displayed on the monitor 40 so that the user can know the current points, that is, the amount of payment to the administrator of the system 1.

In step S27, the terminal device 30
Transmits a download request for a list of downloadable contents from the transmission unit 31 to the server device 10. When the receiving unit 11 of the server device 10 receives the download request, the server unit 10 causes the search update unit 16 to store the download request in the storage unit 1.
5, a list of downloadable contents is created, and this list is transmitted to the terminal device 30 in step S28. In step S29, when the terminal device 30 receives the list of downloadable contents transmitted from the server device 10, the terminal device 30 monitors the list of downloadable contents.
Display at 0. Specifically, the monitor 40 displays the title, data size, artist name, lyricist name, composer name, arranger name, etc. of the downloadable content, and the user refers to these information to download. Allows you to select content.

In step S30, the terminal device 30 selects one or a plurality of contents to be downloaded from the list displayed on the monitor 40 according to the operation signal input by the user operating the operation unit 43. Then, a selection signal for identifying the selected content is generated, and the selection signal is transmitted from the transmission unit 31 to the server device 10. In step S31, the server device 10
When the receiving unit 11 receives the selection signal transmitted from the terminal device 30, in step S32, the user required by the user to download this time according to the selection signal, that is, according to the price of the content selected by the user. Calculate payment points. The calculation of the user payment points is performed with reference to the standard consideration information in the header H shown in FIG. In step S33, the terminal device 30
The transmitting unit 12 transmits the calculated user payment points to the terminal device 30. In step S34, when the terminal device 30 receives the user payment points transmitted from the server device 10 by the receiving unit 32, the terminal device 30 monitors the user payment points.
Is displayed on the screen so that the user can know the points required for downloading, that is, the amount of money.

When the selected content is downloaded, in step S35, the terminal device 30 is settled by the user, using the payment method and the credit card, or the points of the present system 1. When the selection of whether to use these combinations or the like is made, the transmission unit 31 transmits the selection to the server device 10.

In step S36, the server device 10
When receiving the payment method transmitted from the terminal device 30, the search update unit 16 then accesses the user point management record shown in Table 1 of the storage unit 15 in step S37. Then, the search update unit 16 adds points according to the content to be downloaded to the user payment points of the user ID who downloads the content.

In step S38, the search update unit 16
Accesses the right holder management record that manages the points of the right holder of the content shown in Table 2 below.

[0061]

[Table 2]

As shown in Table 2 above, the right holder point management record for managing the points of the right holder of the contents has the right holder ID, right holder payment points, and settlement account information as fields. . When the content is downloaded, the search update unit 16 adds points to the right holder related to the downloaded content. This point is paid from the administrator of the system 1 to the right holder as a copyright fee, and one point is converted into, for example, 1 yen. The search update unit 16 accesses such a right holder point management record and adds points according to a predetermined distribution to the right holder payment points of the right holder ID related to the downloaded content. Specifically, the search update unit 16 uses the table 2 above.
The right holder to be distributed is specified by the right holder ID in the header H of
Points are added to each right holder according to the right holder distribution rate.

When the user point management record and the manager point management record are updated by the search / update unit 16, then, in step S39, the search / update unit 1 is updated.
6 reads the content data D from the storage unit 15 and outputs it to the encryption unit 17. Then, the encryption unit 17 reads the content key from the encryption key holding unit 18, and uses this content key to encrypt the content unit C with DES, for example. Next, the encryption unit 17 encrypts the content key used for encryption of the content unit C with the user ID of the terminal device 30 that further transmits the content key. Also,
In step S40, the encryption unit 17 reads the APL key from the encryption key holding unit 18, and the content data D
Is encrypted with the APL key. The encryption unit 17 also calculates the CRC.
Then, the encryption unit 17 encrypts not only the user ID but also the content ID, the right holder ID, and the CRC with the APL key.

In step S41, the encryption unit 17
Encrypts the content section C with the content key, the content key with the user ID, the content ID,
The header part H is formed by encrypting the right holder ID, the user ID, and the CRC with the APL key. In step S42, the transmission unit 12 of the server device 10 generates the content data D as shown in FIG. 2 and transmits the content data D to the terminal device 30. In step S34, when the receiving unit 32 receives the content data D, the terminal device 30 stores the content data D in the memory 33 or the like. That is, in the removable recording medium 3 mounted in the memory 33 or the mounting portion 41, the content portion C is encrypted with the content key, the content key is encrypted with the user ID, and the user ID is further encrypted with the APL key. Two
Content data D shown in is stored.

As described above, the content data D is downloaded in the state where the content portion C is encrypted with the content key, the content key is encrypted with the user ID, and the user ID is encrypted with the APL key. Therefore, even when the content data D to be illegally downloaded to a third party is acquired, the decryption of the content is extremely difficult, so that the content section C can be prevented from being reproduced. it can. The downloaded content data D can be exchanged between users.

Therefore, a case where the content data D acquired from the server device 10 as described above is exchanged between the terminal devices 30 by wire or wirelessly without using the removable recording medium 3 will be described with reference to FIG. First, when the user operates the operation unit 43, the terminal device 30 on the receiving side makes a download request from the device communication unit 42 to the device communication unit 42 of the terminal device 30 on the transmission side in step S51. In step S52, the terminal device 30 on the transmission side in the reception standby state receives the download request in the inter-device communication unit 42, and then in step S53, the removable recording medium 3 mounted in the memory 33 and / or the mounting unit 41. A list of stored contents is created, and this is sent to the terminal device 3 on the receiving side from the inter-device communication unit 42.
Send to 0.

In step S 54, when the terminal device 30 on the receiving side receives the list of downloadable contents transmitted from the terminal device 30 on the transmitting side, it displays this on the monitor 40. Specifically, the monitor 40
The title, data size, artist name, lyricist name, composer name, arranger name, etc. of the downloadable content are displayed so that the user can refer to these information and select the content to download. .

In step S55, the terminal device 30 on the receiving side selects the content to be downloaded from the list displayed on the monitor 40 in accordance with the operation signal input by the user operating the operation unit 43. ,
A selection signal for identifying the selected content is generated, and this selection signal is transmitted from the inter-device communication unit 42 to the terminal device 30 on the transmission side.

In step S56, when the terminal device 30 on the transmitting side receives the selection signal from the terminal device 30 on the receiving side in the inter-device communication section 42, the content data D corresponding thereto is searched and extracted. In step S57, the terminal device 30 on the transmitting side transmits the content data D extracted from the memory 33 or the removable recording medium 3 to the terminal device 30 on the receiving side from the inter-device communication unit 42 without decrypting the cipher. . In step S58,
When the terminal device 30 on the receiving side receives the content data D transmitted from the terminal device 30 on the transmitting side in the terminal device 30 on the transmitting side, the terminal device 30 stores the content data D in the memory 33 or the removable recording medium 3 as it is. When the content data D is stored in the removable recording medium 3, the content data D can be copied to another terminal device 30 using the removable recording medium 3.

A case where the content data D is exchanged between the terminal devices 30 using the removable recording medium 3 will be described with reference to FIG. First, in step S61, the removable recording medium 3 in which one or a plurality of content data D is stored is mounted in the mounting unit 41 of the terminal device 30, and the removable recording medium is operated according to the operation of the operation unit 43 performed by the user. Drive 3 In step S62, the terminal device 30 reads TOC (Table Of Contents) and the like from the removable recording medium 3,
A list of contents recorded on the removable recording medium 3 is created and displayed on the monitor 40. Specifically, on the monitor 40, the title of downloadable content, data size, artist name, lyricist name,
The composer name, arranger name, etc. are displayed, and the user can refer to these information to select the content to be downloaded.

In step S 63, the terminal device 30 selects the content to be downloaded from the list displayed on the monitor 40 according to the operation signal input by the user operating the operation unit 43. In step S 64, the terminal device 30 reads the selected content data D from the removable recording medium 3 mounted on the mounting unit 41 and stores it in the memory 33. Here, the content data D read from the removable recording medium 3 is the one shown in FIG. 2 and is stored in the memory 33 as it is without decryption of the code.

As described with reference to FIGS. 9 and 10, when the content data D is exchanged between the terminal devices 30, the server device 10 is not involved, so that the profit is distributed to the right holders related to the content. Will not be done. Therefore, in this system 1, the content data D
At the time of the exchange, the encryption is not decrypted. That is, the content data D stored in the receiving-side terminal device 30 has the content key encrypted using the user ID of the sending-side terminal device 30, and the receiving-side terminal device 30 encrypts the content key. The content cannot be decrypted, and the received content cannot be reproduced as it is.
Therefore, in the present system 1, the user who directly receives the content data D from another terminal device 30 is the terminal device 3
The server device 10 is accessed from 0 to update the user ID, and the fee is charged here.

This will be described with reference to FIG. First,
In step S71, when the user performs a user ID transmission operation on the operation unit 43 in step S71, the user ID in the state encrypted with the APL key is read from the memory 33, and the read encryption is performed. User ID transmitter 3
1 to the server device 10. The server device 10 in the reception standby state in step S72 receives the encrypted user ID transmitted from the terminal device 30 in the receiving unit 11 in step S73, and decrypts the encrypted user ID in the encryption / decryption unit 13. To do. That is, the encryption / decryption unit 13
Reads the APL key from the encryption key holding unit 18 and uses this APL key to decrypt the encryption of the user ID. In step S74, the search update unit 16 of the server device 10
Using the plaintext user ID as a keyword
The user point management record shown in Table 1 of the database constructed in FIG. 1 is accessed to extract the user payment points of the user ID, and then step S75.
At, the user payment point is transmitted to the terminal device 30. In step S <b> 76, when the receiving unit 32 of the terminal device 30 receives the user payment point transmitted from the server device 10, the terminal device 30 displays it on the monitor 40. At the same time, the terminal device 30 refers to the standard price information obtained by decrypting the encryption using the APL key from the header portion H of the content data D to be authorized, and is required to authorize the content data D. The payment points, or prices, are displayed on the monitor 40. Thereby, the terminal device 30
Makes it possible to know the payment points to the administrator of the present system 1 when the content data D is licensed, that is, the amount of money.

In step S77, when the user operates the operation unit 43 so as to request the right to make the content data D received from the other terminal device 30 his / her own name, the terminal device 30 causes the transmission unit 31 to operate. An authorization request is transmitted to the server device 10. In step S78, the server device 10 causes the receiving unit 11 to operate the terminal device 30.
Then, the transmission unit 12 transmits to the terminal device 30 a transmission request for the header portion H of the content data D that the user desires to acquire. In step S79, the terminal device 30 extracts the header part H from the content data D in the header extraction part 34 according to the user's operation, and the header part H is extracted from the transmission part 31 in the server device 1.
Send to 0.

In step S80, the server device 10
In the receiving section 11, the header section H transmitted from the terminal device 30 is received. In step S81, the server device 10 confirms the resale information in the header H. The resale information is the number of times the content data can be transferred between users and the like, and the server device 10 determines whether the content data D for which a right request has been made is less than or equal to the resale number. Then, when the number of resaleable times is exceeded, the server device 10 stops the process of obtaining the right.

Here, in the server device 10, the encryption / decryption unit 13 reads the APL key from the encryption key holding unit 18, and decrypts the contents ID of the header part H, the right holder ID, the user ID and the CRC code. Then, the CRC is recalculated and it is determined whether or not it matches the value of the CRC in the header part H. When they do not match, it is determined that there is a high possibility that the header part H has been tampered with, You may make it stop the process of right-granting.

In step S82, the server device 10
Transmits a request from the transmission unit 12 to the terminal device 30 as to what payment method to use. In step S83, the terminal device 30, after being received by the receiving unit 32, is operated by the user to make a payment using a payment method, a credit card, or make a payment using points of the present system 1, or a combination thereof. When it is selected whether to use or not, the transmitting unit 31 transmits this to the server device 10.

In step S84, the server device 10
When receiving the payment method transmitted from the terminal device 30, the search update unit 16 accesses the user point management record shown in Table 1 of the storage unit 15 in step S85. Then, the search update unit 16 adds points according to the standard price information of the content to the user payment points of the user ID of the user who is the new owner of the content.

Further, in step S86, the search update section 16 accesses the right holder management record for managing the points of the right holder of the contents shown in Table 2 above. The search update unit 16 adds points according to a predetermined distribution to the right holder payment points of the right holder ID related to the content. Specifically, the search update unit 16 identifies the right holder to be distributed by the right holder ID in the header H of Table 2 above, and adds points to each right holder according to the right holder distribution ratio.

When the user update management record and the administrator update management record are updated by the search update unit 16, then in step S87, the server device 1
The encryption / decryption unit 13 of 0 stores the APL key in the encryption key storage unit 1
8, the user ID in the header part H is decrypted. In step S88, the search update unit 16 accesses the user point management record shown in Table 1 of the storage unit 15 and subtracts points according to the distributor distribution rate from the user payment points of the decrypted user ID. That is, since the user indicated by the original user ID has contributed to the distribution of the content, the server device 10 reduces the payment points according to the degree of contribution, that is, pays the administrator of the present system 1. The amount is reduced to give a privilege to this user.

In step S89, the encryption / decryption unit 1
3 uses the decrypted user ID to decrypt the encryption of the content key. In step S90, the server device 1
The encryption unit 17 of 0 encrypts the content key with the user ID of the user who is requesting the rights. Step S91
At, the encryption unit 17 reads the APL key from the encryption key holding unit 18, and encrypts the user ID, which is the encrypted content key, using the APL key. Step S9
2, the search update unit 16 uses the user I of the header part H.
D is used as the user ID of the user who made the right request, the resale information is decremented by 1, and a new header part H is generated with the original user ID as the distributor ID. In step S93, the server device 10 transmits the updated header portion H to the terminal device 30 from the transmission unit 12.

In step S94, the terminal device 30
When the header section H updated by the receiving section 32 is received,
Next, in step S95, the new header section H received is overwritten on the header section H of the corresponding content data D. Thus, the name of the content data D received from the other terminal device 30 becomes the name of the transferee, matches the user ID stored in the memory of the terminal device 30, and the content can be reproduced.

In the present system 1, the user ID is changed to his own user ID by being transferred from a friend in this way,
The content data D in its own name can be further transferred to the transferee's friend or the like by the method shown in FIGS. 9 and 10. For example, the case where the content data D is transferred from the user A to the user B, and the content data D is further transferred to the user C will be described as an example. The search update unit 16 of the server device 10 determines that the user ID is the user B. In addition to updating from user A to user C, user B is added to the distributor ID column in addition to user A. Further, the search update unit 16 distributes a part of the consideration to the user A and the user B based on the distributor distribution rate, and updates the user payment points shown in Table 1 above. The number of times this transfer can be repeated is
It is determined according to the resale information in the header part H. As described above, in the present system 1, the content data D can be transferred up to the transferable number of times as resale information, and the distributor stored in the header portion H contributes to the distribution each time it is transferred. As a result, it is possible to receive a privilege according to the distributor distribution rate.

Next, the processing when the user performs the settlement using the terminal device 30 will be described with reference to FIG.
First, in step S101, when the user performs a user ID transmission operation on the operation unit 43, the terminal device 30 returns A
The user ID encrypted with the PL key is read from the memory 33, and the read encrypted user ID is transmitted from the transmission unit 31 to the server device 10.

The server device 10 in the reception standby state in step S102 receives the reception unit 1 in step S103.
In 1, the encrypted user ID transmitted from the terminal device 30 is received, and the encryption / decryption unit 13 decrypts the encrypted user ID. That is, the encryption / decryption unit 13 reads the APL key from the encryption key holding unit 18, and decrypts the encryption of the user ID using this APL key. In step S104, the search update unit 16 of the server device 10 accesses the user point management record of the database built in the storage unit 15 by using the plaintext user ID as a keyword, and extracts the user payment points of the user ID. ,
Next, in step S105, this user payment point is transmitted to the terminal device 30. In step 106, when the terminal device 30 receives the user payment point transmitted from the server device 10 by the receiving unit 32, the terminal device 30 displays the user payment point on the monitor 40 so that the user can confirm the payment amount.

In step S107, the terminal device 30
Generates a settlement request signal according to the user's operation, and transmits it to the server device 10 from the transmission unit 31. When the server unit 10 receives the settlement request transmitted from the terminal device 30 by the receiving unit 11 in step S108, next, in step S109, the server device 10 performs settlement of the user. That is, the server device 10 generates the user billing data shown in Table 1 with the user payment points and 1 point as 1 yen. In step S110, the server device 10 transmits this billing data to the settlement center 4 connected by a dedicated line. Thus, the server device 10 can perform the settlement process according to the user's request. Of course, the server device 10 may settle each user at predetermined intervals, for example, on a monthly basis.

Regarding the settlement of the right holder, the server device 10 accesses the right holder payment point management record shown in Table 2 above in response to a request from the right holder or every predetermined period, and 1 point is 1 yen. Payment is made and the data is transmitted to the settlement center 4, whereby the right holder is paid.

Next, as shown in FIG. 8, the server device 1
Content data D downloaded from
As shown in FIG. 1, processing of the terminal device 30 when reproducing the content data D acquired and acquired from another terminal device 30 will be described with reference to FIG. For example, monitor 4
At 0, a list of the content data D stored in the removable recording medium 3 mounted on the memory 33 or the mounting section 41 is displayed, and the content reproduced by the user from the list displayed on the monitor using the operation section 43. When the data D is selected, in step S121, the terminal device 30 causes the header extraction unit 34 to copy the header portion H of the selected content data D from the memory 33 in which the content data D is stored or the removable recording medium 3. It is read and output to the encryption / decryption unit 35. Step S
At 122, the encryption / decryption unit 35 uses the encryption key holding unit 3
The APL key is read from 6, and in step S123, the encryption of the user ID in the header H extracted by the header extracting unit 34 is decrypted using this APL key. The data in the header H to be decrypted by the APL key may be determined according to the content displayed on the monitor 40, for example, when the artist name, lyricist name, composer name, arranger name, etc. are displayed on the monitor 40, The encryption of the right holder ID may be decrypted with the APL key.

In step S124, the discriminator 37
Determines whether the user ID stored in the memory of the device and the user ID extracted from the header portion H and decrypted with the APL key match. And the terminal device 30
When the user ID extracted from the header portion H matches the user ID read from the memory, step S1
25. If they do not match, the reproduction of the content data D is prohibited in step S130.

Here, in the terminal device 30, the encryption / decryption unit 35 reads the APL key from the encryption key holding unit 36, and decrypts the content ID of the header part H, the right holder ID, the user ID and the CRC code. Then, the CRC is recalculated and it is determined whether or not it matches the value of the CRC in the header part H. When they do not match, it is determined that there is a high possibility that the header part H has been tampered with, Reproduction may be prohibited.

In step S125, the encryption / decryption unit 35 decrypts the encryption of the content key of the header portion H using the user ID decrypted with the APL key. Step S
At 126, the terminal device 30 starts reading the content section C corresponding to the header section H. Step S1
In 27, the encryption / decryption unit 35 sequentially decrypts the encryption of the content portion H using the content key decrypted with the user ID, and outputs the decrypted data to the reproduction processing unit 38. In step S128, the reproduction processing unit 38
Performs decompression processing on data compressed in a format such as ATRAC3. Then, the reproduction processing unit 38 converts the expanded data from a digital signal into an analog signal by the D / A converter, outputs the sound from the speaker 39, and displays it on the monitor 40.

In step S129, the terminal device 30
Judges whether or not the reproduction of the content portion C of the selected content data D is completed. When the reproduction is completed, the reproduction operation is ended, and when not completed, the process returns to step S126. According to the reproduction processing method described above, reproduction of the content data D is permitted only when the user ID in the header portion H forming the content data D and the user ID in the memory of the apparatus body match. Thus, it is possible to prohibit the reproduction of the content data D that is not in his / her name.

In the system 1 as described above, in order to make the content data D its own name, as shown in FIGS. 8 and 11, the server device 10 charges, that is, adds payment points. . Therefore, in the present system 1, it is possible to prevent the profit of the right holder such as the copyright holder related to the content from being damaged. In addition, the content data D is passed to another person, and the transferee user
When the content data D shown in 1 is rewritten to its own name, a profit such as a payment discount is given to the user who is the transferor. Therefore, the system 1 can efficiently disseminate contents. Further, in this system 1, when the name is changed, only the header portion H needs to be transmitted from the terminal device 30 to the server device 10, and therefore, the data exchanged between the terminal device 30 and the server device 10 can be performed. The size can be reduced, the load on the server device 10 and the terminal device 30 can be reduced, the communication time can be shortened, and the convenience can be improved.

Note that the processing described above does not necessarily have to be processed in time series in the order described as a flowchart, and can be executed in parallel or individually (for example, parallel processing or processing by objects). It may be.

[0095]

According to the present invention, content data having a header part and a content part, in which at least owner identification data of the content part is stored, is received from another terminal device and stored in the storage means. Then, the header portion of the content data stored in the storage means is transmitted, the transmitted header portion is received, the owner identification data of the received header portion is updated to new owner identification data, and this update is performed. The header section is transmitted, the transmitted header section is received, and the content data having the updated header section is reproduced only when the header section is updated. Allow playback of content,
The interests of copyright holders can be protected.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a data communication system to which the present invention is applied.

FIG. 2 is a diagram illustrating a data format when data is exchanged between a server device and a terminal device and between the terminal devices in the present system 1.

FIG. 3 is a diagram functionally explaining a server device constituting a data communication system to which the present invention is applied.

FIG. 4 is a diagram illustrating a hardware configuration of a server device.

FIG. 5 is a diagram functionally explaining a terminal device that constitutes a data communication system to which the present invention is applied.

FIG. 6 is a diagram illustrating a hardware configuration of a terminal device.

FIG. 7 is a flowchart illustrating a procedure in which a user installs an application program required for the system in a terminal device when using the system.

FIG. 8 is a flowchart illustrating a procedure for downloading content data desired by a user.

FIG. 9 is a flowchart illustrating a procedure for exchanging content data acquired from a server device between terminal devices 30.

FIG. 10 is a flowchart illustrating a procedure for exchanging content data between terminal devices using a removable recording medium.

FIG. 11 is a flowchart illustrating a procedure when a user who directly receives content data from another terminal device accesses the server device from the terminal device and updates the user ID.

FIG. 12 is a flowchart illustrating a procedure when a user makes a settlement using a terminal device.

FIG. 13 is a flowchart illustrating processing of the terminal device when reproducing content data.

[Explanation of symbols]

1 data communication system, 2 network, 3 removable recording medium, 4 settlement center, 10 server device,
30 terminal devices

Claims (28)

[Claims] 1. A first receiving means for receiving content data from another terminal device, the content data comprising a header part and a content part, and at least the owner identification data of the content part is stored in the header part, and the first receiving means. First transmitting means for transmitting a header portion of the content data received by the receiving means, second receiving means for receiving the header portion transmitted by the first transmitting means, and second receiving means Updating means for updating the owner identification data of the header portion received in step 1 to new owner identification data, and second transmitting means for transmitting the header portion updated by the updating means to the first receiving means, Reproducing means for reproducing the content data having the updated header portion received by the first receiving means, and reproducing the content data by the reproducing means, wherein the header portion is updated. A data communication system comprising: a permitting unit that permits only when updated by a unit. 2. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and the permission means is the updated owner identification. The data communication system according to claim 1, wherein the encryption of the content unique data is decrypted using the data, and the decryption of the content portion is decrypted using the decrypted content unique data to permit the reproduction of the content portion. 3. A billing processing means is further provided, wherein the billing processing means, when the owner identification data is updated, carries out a reduction processing for the transferor and a billing processing for the transferee. The data communication system according to item 1. 4. The header section stores the number of times of transferable copying for transferring the content data by copying, and the updating means stores the number of times of transferable copying less than the number of times of transferable copying.
The data communication system according to claim 1, wherein the owner identification data is updated. 5. The content data, which is composed of a header part and a content part and in which at least the owner identification data of the content part is stored, is received from another terminal device, stored in a storage means, and the storage means is received. The header part of the content data stored in is transmitted, the transmitted header part is received, the owner identification data of the received header part is updated to new owner identification data, and the updated header is updated. A data communication method of transmitting a part, receiving the transmitted header part, and reproducing content data having the updated header part only when the header part is updated. 6. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and the content is updated when the content data is reproduced. The data communication method according to claim 5, wherein the encryption of the content unique data is decrypted using the owner identification data, and the encryption of the content portion is decrypted using the decrypted content unique data. 7. The data communication method according to claim 5, wherein when the owner identification data is updated, a deduction process is performed on the transferor and a charging process is performed on the transferee. 8. The header section stores the transferable number of times that the content data is copied and transferred, and the owner identification data is updated when the copy transferable number is less than or equal to the copy transferable number. Item 5. The data communication method according to item 5. 9. A header section transmitted from a terminal apparatus that has received content data including a header section transmitted from another terminal apparatus and a content section and at least the owner identification data of the content section stored in the header section. Receiving means, an updating means for updating the owner identification data of the header section received by the receiving means to new owner identification data, and a header section updated by the updating means for transmitting to the terminal device. A data communication device comprising a transmitting means. 10. A billing processing means is further provided, wherein when the owner identification data is updated, the billing processing means performs a deduction process for the transferor and a billing process for the transferee. Item 9. The data communication device according to item 9. 11. The header section stores a transferable number of times of copying and transferring the content data, and the updating means sets the copy transferable number of times less than or equal to the copy transferable number of times.
The data communication device according to claim 9, wherein the owner identification data is updated. 12. A header part transmitted from a terminal device that has received content data including a header part transmitted from another terminal device and a content part and at least the owner identification data of the content part stored in the header part. Is received, the owner identification data of the received header section is updated to new owner identification data, and the updated header section is transmitted to the terminal device. 13. The data communication method according to claim 12, wherein when the owner identification data is updated, the transferor is reduced and the transferee is charged. 14. The header section stores a copy transferable number of times to copy and transfer the content data, and updates the owner identification data when the copy transferable number of times is less than or equal to the copy transferable number of times. Item 12. The data communication method according to Item 12. 15. A recording medium having a computer program executable by a computer recorded thereon, the computer program comprising a header section and a content section transmitted from another terminal device, and at least the content section in the header section. Receiving the header part transmitted from the terminal device that has received the content data in which the owner identification data is stored, updating the owner identification data of the received header part to new owner identification data, and And a step of transmitting the updated header portion to the terminal device. 16. The computer program according to claim 15, further comprising a step of performing a deduction process for a transferor and a charging process for a transferee when the owner identification data is updated. recoding media. 17. The header section stores a copy transferable number of times to copy and transfer the content data, and the computer program stores the owner identification data when the copy transferable number of times is less than or equal to the copy transferable number of times. 16. The recording medium according to claim 15, further comprising the step of updating. 18. A computer program executable by a computer, the content data comprising a header part transmitted from another terminal device and a content part, wherein at least the owner identification data of the content part is stored in the header part. Receiving the header part transmitted from the terminal device, and updating the owner identification data of the received header part to new owner identification data, and transmitting the updated header part to the terminal device. A computer program having the steps of: 19. The computer program according to claim 18, further comprising the step of, when the owner identification data is updated, performing a reduction process on the transferee and a charging process on the transferee. 20. The header section stores a transferable number of times of copying and transferring the content data, and when the copy transferable number of times or less, updates the owner identification data. The computer program according to claim 18, comprising: 21. First transmission means for transmitting to another terminal device content data, which comprises a header portion and a content portion and at least the owner identification data of the content portion is stored in the header portion; and the other terminal. First receiving means for receiving the content data transmitted from the first transmitting means of the device, and second transmitting means for transmitting the header portion of the content data received by the first receiving means to the management device. A second receiving unit that receives the header part whose owner identification data is updated by the management device; a reproducing unit that reproduces the content data having the updated header unit received by the second receiving unit; Data communication including permission means for permitting the reproduction of the content data by the reproduction means only when the header section is updated by the management device. Location. 22. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and the permission means is the updated owner identification. 22. The data communication device according to claim 21, wherein the content-specific data is decrypted using data, and the decrypted content-specific data is used to decrypt the content-part encryption, thereby permitting reproduction of the content part. 23. The content data, which is transmitted from another terminal device and has a header part and a content part and at least the owner identification data of the content part is stored in the header part, the header of the received content data is received. Part to the management device, the management device receives the header part with the updated owner identification data, and the content data having the updated header part is received only when the header part is updated. Data communication method to play. 24. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and is updated when the content data is reproduced. 24. The data communication method according to claim 23, wherein the encryption of the content unique data is decrypted using the owner identification data, and the encryption of the content portion is decrypted using the decrypted content unique data. 25. A recording medium in which a computer program executable by a computer is recorded, the computer program comprising a header part and a content part transmitted from the other terminal device, and at least the content in the header part. Receiving the content data in which the owner identification data of the copy is stored, transmitting the header part of the received content data to the management device, and the header part in which the owner identification data is updated in the management device And playing the content data having the updated header section only when the header section is updated. 26. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and the computer program reproduces the content data. 26. The recording medium according to claim 25, further comprising: decrypting the encryption of the content unique data using the updated owner identification data, and decrypting the encryption of the content part using the decrypted content unique data. 27. A computer program executable by a computer, the content comprising a header part and a content part transmitted from the other terminal device, and at least the owner identification data of the content part is stored in the header part. The step of receiving data, the step of transmitting the header part of the received content data to the management device, the step of receiving the header part in which the owner identification data is updated in the management device, and the header part is updated Playing the content data having the updated header section only when the computer program is running. 28. The content section is encrypted with content unique data, the content unique data is encrypted with the owner identification data, and the content is updated when the content data is reproduced. The computer program according to claim 27, further comprising the step of decrypting the encryption of the content unique data using the owner identification data, and decrypting the encryption of the content portion using the decrypted content unique data.