JP6389558B1 - Content data management system, server device, control method, and control program - Google Patents

Abstract

There is provided a server device capable of easily grasping the status of transfer and use of rights related to content data while maintaining high security. A server device connected to user terminals (20A, 20B, 20C) and an output terminal (30) sharing a block chain via a communication network (2), and a transaction with a content data storage unit (12) that stores content data. The verification unit 132 that verifies, the block generation unit 134 that generates a block based on the verified transaction, the block transmission unit 135 that transmits the block to the user terminal and the output terminal, and the content data in the verified transaction When the output terminal 30 is designated as the right transfer destination, a content data transmission unit 136 that transmits content data to the output terminal 30 is provided. [Selection] Figure 1

Description

  The present invention relates to a content data management system, a server device, a control method, and a control program.

  In recent years, with the development of communication networks such as the Internet, an online market for various content data has been formed. In such an online market, the content data is transferred between a plurality of terminals included in the communication network, so that the transaction of the content data is performed.

  For example, Patent Literature 1 discloses an online gift system including a server system and a plurality of clients. In the online gift system, the encrypted gift content is transferred from the gift source client to the gift destination client. The gift destination client acquires the decryption key from the server system, and decrypts the gift content encrypted using the decryption key.

Japanese Patent Laid-Open No. 11-143955

  However, according to the configuration in which the encrypted content data is transferred between the clients, the content data can be traded relatively easily. However, if the decryption key of the content data leaks, the content is illegally transferred. There is a risk of being used.

  In addition, information such as the number and time of use of the content data by each client that acquired the content data is important information for the creator and manager of the content data, but it is difficult to grasp the details in detail. It is.

  Therefore, the present invention provides a content data management system, a server device, a control method, and a control program capable of easily grasping the status of transfer and use of rights related to content data while maintaining high security. For the purpose.

  A server device according to an aspect of the present invention is connected via a communication network to a user terminal and an output terminal that share a block chain formed by connecting blocks generated based on a transaction including information related to content data transactions. A content data storage unit that stores content data, a verification unit that verifies a transaction received from a user terminal or an output terminal, a block generation unit that generates a block based on the verified transaction, Content data for transmitting content data to the output terminal when the output terminal is designated as the transfer destination of the right related to the content data in the verified transaction and the block transmission unit that transmits the block to the user terminal and the output terminal A transmitter, and Obtain.

  According to this aspect, the content data is stored in the storage unit included in the server device, and is transmitted to the output terminal only when the output terminal is designated as the right transfer destination of the content data in the transaction. Therefore, high security is maintained for the content data. And the transaction reception part of a server apparatus can receive the transaction which concerns on content data. Therefore, it is possible to easily grasp the status of transfer and use of rights related to content data.

  According to the present invention, a content data management system, a server device, a control method, and a control program that make it possible to easily grasp the status of the transfer of rights and the number of uses of content data while maintaining high security. Can be provided.

It is a figure which shows an example of the content data management system 1 which concerns on 1st Embodiment of this invention. 2 is a block diagram showing a functional configuration of a management server 10. FIG. It is a block diagram which shows the function structure of the user terminal 20A. 3 is a block diagram showing a functional configuration of an output terminal 30. FIG. It is a figure which shows an example of the operation | movement sequence which concerns on tool installation and terminal registration. It is a figure which shows an example of the operation | movement sequence which concerns on the right transfer from the user A (drawing data creator) to the user B (primary user). It is a figure which shows an example of the operation | movement sequence which concerns on the right transfer from the user B (primary user) to the user C (secondary user). It is a figure which shows an example of the operation | movement sequence which concerns on the output instruction | indication to the output terminal 30 by the user C (secondary user). It is a figure which shows an example of the operation | movement sequence which concerns on the output by the output terminal 30, and an output report. It is a figure which shows an example of transaction TX1. It is a figure which shows an example of transaction TX2. It is a figure which shows an example of transaction TX3. It is a figure which shows an example of transaction TX4. It is a figure which shows one line of transaction TX (n + 1). It is a figure which shows one line of transaction TX4 '.

  Embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, what attached | subjected the same code | symbol has the same or similar structure.

[First Embodiment]
(1) Configuration of Content Data Management System 1 FIG. 1 is a diagram showing an example of a content data management system 1 according to the first embodiment of the present invention.

  The content data management system 1 is a system for managing usage status such as transfer of rights and the number of usages of predetermined content data. For this purpose, the content data management system 1 includes a management server 10, user terminals 20 </ b> A, 20 </ b> B, 20 </ b> C, and an output terminal 30 that are communicably connected to each other via a communication network 2 such as the Internet. The management server 10, the user terminals 20A, 20B, 20C, the output terminal 30, and the like constitute a P2P (Peer to Peer) network or a network based thereon, and share a block chain that is a distributed encryption database.

  Here, as the block chain in the present embodiment, any configuration may be adopted as long as it is a configuration in which blocks including transactions describing transaction contents related to transfer and use of content data rights are connected. it can. For example, the block may include a hash value of a block before satisfying a predetermined condition and transaction details related to the content data. For example, the block may include a value (nonce) used for calculating the hash value. The content data may be data related to content in any form such as document data, image data, moving image data, audio data, drawing data, and includes, for example, data of electronic documents and electronic books. The transaction content indicated by the transaction may include any content, and includes, for example, the transfer of the right to use content data from one user to another. In addition, the transaction may include an amount (number of times, time, etc.) that can be used depending on the usage mode (printing or displaying a document or image, playing a moving image, manufacturing a three-dimensional object) according to the type of content data.

  Below, the case where the content data management system 1 is applied to distribution of drawing data for creating a modeled object with a 3D printer will be described as an example.

  FIG. 2 is a block diagram illustrating a functional configuration of the management server 10.

  The management server 10 stores drawing data and manages usage status such as transfer of rights and the number of times of usage related to the drawing data. For this purpose, the management server 10 includes a server communication unit 11, a server storage unit 12, and a server processing unit 13.

  The server communication unit 11 includes a communication interface circuit for connecting the management server 10 to the communication network 2, and performs communication with the communication network 2. And the server communication part 11 supplies the data received from user terminal 20A, 20B, 20C, the output terminal 30, etc. to the server process part 13. FIG. In addition, the server communication unit 11 transmits the data supplied from the server processing unit 13 to the user terminals 20A, 20B, 20C, the output terminal 30, and the like.

  The server storage unit 12 includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device, and stores a computer program and data used for processing in the server processing unit 13. For example, the server storage unit 12 stores, as a computer program, an administrator tool that is an application program related to drawing data management. For example, the server storage unit 12 stores a terminal table, a block chain, and drawing data as data. The terminal table is a table in which information (public key, software classification information, etc.) of each terminal (node) such as the user terminals 20A, 20B, 20C, and the output terminal 30 included in the content data management system 1 is registered. The drawing data is drawing data to be managed by the content data management system 1 and is, for example, drawing data supplied from an arbitrary node included in the content data management system 1.

  The server processing unit 13 includes one or a plurality of processors and their peripheral circuits. The server processing unit 13 is a CPU, for example, and comprehensively controls the overall operation of the management server 10. The server processing unit 13 controls the operation of each unit of the management server 10 so that various processes of the management server 10 are executed in an appropriate procedure based on a program stored in the server storage unit 12.

  The server processing unit 13 includes a terminal management unit 131, a transaction verification unit 132, a drawing data registration unit 133, a block generation unit 134, a block transmission unit 135, and a drawing data transmission unit 136. Each of these units is a functional module executed by a processor included in the server processing unit 13 based on the above-described administrator tool stored in the server storage unit 12. The terminal management unit 131 relates to each terminal (user terminals 20A, 20B, 20C, output terminal 30 and the like) included in the content data management system 1 by appropriately updating a terminal table stored in the server storage unit 12, for example. Manage information. For example, the transaction verification unit 132 verifies a transaction received from each terminal included in the content data management system 1. For example, the drawing data registration unit 133 stores the drawing data received from the user terminal in the server storage unit 12. The block generation unit 134 generates a block based on a transaction, for example. For example, the block transmission unit 135 transmits (broadcasts) the generated block to each terminal included in the content data management system 1. For example, the drawing data transmission unit 136 transmits the drawing data stored in the server storage unit 12 to a predetermined output terminal according to the contents of the transaction received from each terminal included in the content data management system 1.

  FIG. 3 is a block diagram illustrating a functional configuration of the user terminal 20A. Note that the configurations of the user terminals 20B and 20C are the same as the configuration of the user terminal 20A, and thus the description thereof is omitted.

  The user terminal 20A executes processing related to generation of a transaction related to transfer of the right of drawing data and processing related to an instruction to output a shaped object based on the drawing data. Therefore, the user terminal 20A includes a user terminal communication unit 21, a user terminal operation unit 22, a user terminal display unit 23, a user terminal storage unit 24, and a user terminal processing unit 25.

  The user terminal communication unit 21 includes a communication interface circuit for connecting the user terminal 20 </ b> A to the communication network 2, and performs communication with the communication network 2. Then, the user terminal communication unit 21 supplies the data received from the management server 10 or the like to the user terminal processing unit 25. In addition, the user terminal communication unit 21 transmits the data supplied from the user terminal processing unit 25 to the management server 10 or the like.

  The user terminal operation unit 22 is realized by an operation button or the like provided on the operation panel, for example. The user terminal operation unit 22 may be any device as long as the user terminal 20A can be operated, such as a touch pad, a keyboard, and a button. When operated by the user, the user terminal operation unit 22 generates a signal corresponding to the operation. The generated signal is supplied to the user terminal processing unit 25 as a user instruction.

  The user terminal display unit 23 may be any device as long as it can display video, images, and the like, and is, for example, a liquid crystal display or an organic EL (Electro-Luminescence) display. The user terminal display unit 23 displays an image or the like according to the image data supplied from the user terminal processing unit 25.

  The user terminal storage unit 24 includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device. The user terminal storage unit 24 stores computer programs and data used for processing in the user terminal processing unit 25. For example, the user terminal storage unit 24 stores, as a computer program, a user tool that is an application program related to transfer and use of drawing data rights. For example, the user terminal storage unit 24 stores, as data, a block chain, a secret key of the user terminal, and a public key of another terminal (including the user terminal and the output terminal).

  The user terminal processing unit 25 includes one or a plurality of processors and their peripheral circuits. The user terminal processing unit 25 is, for example, a CPU, and comprehensively controls the overall operation of the user terminal 20A. The user terminal processing unit 25 controls the operation of each unit of the user terminal 20A so that various processes of the user terminal 20A are executed in an appropriate procedure based on a program or the like stored in the user terminal storage unit 24.

  The user terminal processing unit 25 includes a key generation unit 251, a terminal registration request unit 252, a transaction generation unit 253, a transaction transmission unit 254, and a block processing unit 255. Each of these units is a functional module that is executed by a processor included in the user terminal processing unit 25 based on the above-described user tool stored in the user terminal storage unit 24. For example, the key generation unit 251 generates a key pair including a secret key and a public key unique to the terminal by an arbitrary method. The terminal registration request unit 252 transmits, for example, a terminal registration request including a public key and software classification information to the management server 10. The transaction generation unit 253 generates a transaction in which predetermined transaction conditions are described, for example. For example, the transaction transmission unit 254 transmits the generated transaction to the management server 10. For example, the block processing unit 255 verifies the block received from the management server 10 and adds it to the block chain stored in the user terminal storage unit 24.

  FIG. 4 is a block diagram illustrating a functional configuration of the output terminal 30.

  The output terminal 30 is a device that outputs content based on content data. In the present embodiment, the output terminal 30 is assumed to be a 3D printer (stereoscopic printing machine) for producing a resinous three-dimensional object based on the drawing data. For this purpose, the output terminal 30 includes an output terminal communication unit 31, an output unit 32, an output terminal storage unit 33, and an output terminal processing unit 34.

  The output terminal communication unit 31 includes a communication interface circuit for connecting the output terminal 30 to the communication network 2, and performs communication with the communication network 2. Then, the output terminal communication unit 31 supplies the command received from the user terminal 20C to the output terminal processing unit 34. The output terminal communication unit 31 transmits the data supplied from the output terminal processing unit 34 to the management server 10 or the like.

  The output unit 32 includes an arm having a resin injection part that is cured by ultraviolet irradiation, an ultraviolet light emitting part for irradiating the resin injected from the arm with ultraviolet light, and a drive unit such as the arm and the ultraviolet light emitting part. Therefore, it is possible to mold a three-dimensional molded product made of resin by a photomolding method. Note that the configuration of the output unit 32 is not limited to the configuration described above, and may be a known configuration for realizing an arbitrary method such as a powder method, a hot melt lamination method, a sheet lamination method, and an ink jet method.

  The output terminal storage unit 33 includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device. The output terminal storage unit 33 stores computer programs and data used for processing in the output terminal processing unit 34. For example, the output terminal storage unit 33 stores an output terminal tool, which is an application program related to drawing data output, as a computer program. For example, the output terminal storage unit 33 stores, as data, a block chain, a secret key of the output terminal, and a public key of other terminals (including a user terminal and an output terminal).

  The output terminal processing unit 34 includes one or a plurality of processors and their peripheral circuits. The output terminal processing unit 34 is a CPU, for example, and comprehensively controls the overall operation of the output terminal 30. The output terminal processing unit 34 controls the operation of each unit of the output terminal 30 so that various processes of the output terminal 30 are executed in an appropriate procedure based on a program or the like stored in the output terminal storage unit 33.

  The output terminal processing unit 34 includes a key generation unit 341, a terminal registration request unit 342, a transaction generation unit 343, a transaction transmission unit 344, a block processing unit 345, and an output processing unit 346. Each of these units is a functional module that is executed by a processor included in the output terminal processing unit 34 based on the above-described output terminal tool stored in the output terminal storage unit 33. For example, the key generation unit 341 generates a key pair including a secret key and a public key unique to the terminal by an arbitrary method. The terminal registration request unit 342 transmits, for example, a terminal registration request including a public key and software classification information to the management server 10. The transaction generation unit 343 generates a transaction in which predetermined transaction conditions are described, for example. For example, the transaction transmission unit 344 transmits the generated transaction to the management server 10. For example, the block processing unit 345 verifies the block received from the management server 10 and adds it to the block chain stored in the output terminal storage unit 33.

(2) Operation of Content Data Management System 1 Hereinafter, an operation sequence of the content data management system 1 will be described with reference to FIGS. In the following, it is assumed that user A uses user terminal 20A, user B uses user terminal 20B, and user C uses user terminal 20C and output terminal 30. The user A is a creator of drawing data to be managed by the content data management system 1, and the user B is a primary user who receives the transfer of the drawing data from the user A. Furthermore, the user C is a secondary user who manufactures a shaped article using the output terminal 30 based on the drawing data after receiving the transfer (resale) of the drawing data from the user B.

(2-1) Tool Installation and Terminal Registration FIG. 5 is a diagram illustrating an example of an operation sequence related to tool installation and terminal registration.

(Steps S10A, S10B, S10C, S10X)
First, a user tool is installed on the user terminal 20A by the user A or the like (step S10A). Further, the user tool is installed in the user terminal 20B by the user B or the like (step S10B). Further, the user tool is installed in the user terminal 20C by the user C or the like (step S10C). Further, the output terminal tool is installed in the output terminal 30 by the user C or the like (step S10X).

(Steps S11A, S11B, S11C, S11X)
Next, the key generation unit 251 of the user terminal 20A generates a key pair including the secret key SKA and the public key OKA (Step S11A). Further, the key generation unit 251 of the user terminal 20B generates a key pair including the secret key SKB and the public key OKB (step S11B). Further, the key generation unit 251 of the user terminal 20C generates a key pair including the secret key SKC and the public key OKC (step S11C). In addition, the key generation unit 341 of the output terminal 30 generates a key pair including the secret key SKX and the public key OKX (step S11X).

(Steps S12A, S12B, S12C, S12X)
Next, the terminal registration request unit 252 of the user terminal 20A manages a terminal registration request including the public key OKA generated in step S11A and information (software classification information) indicating that the user tool is installed. It transmits to the server 10 (step S12A). Further, the terminal registration request unit 252 of the user terminal 20B transmits the terminal registration request including the public key OKB generated in step S11B and the software classification information related to the user tool to the management server 10 (step S12B). Further, the terminal registration request unit 252 of the user terminal 20C transmits a terminal registration request including the public key OKC generated in step S11C and the software classification information related to the user tool to the management server 10 (step S12C). Further, the terminal registration request unit 342 of the output terminal 30 transmits a terminal registration request including the public key OKX generated in step S11X and the software classification information related to the output terminal tool to the management server 10 (step S12X).

(Steps S13A, S13B, S13C, S13X)
Next, the terminal management unit 131 of the management server 10 stores the public key OKA and software classification information included in the terminal registration request received from the user terminal 20A in step S12A in the server storage unit 12 in association with the user terminal 20A. Is registered in the terminal table (step S13A). Further, the terminal management unit 131 of the management server 10 stores the public key OKB and the software classification information included in the terminal registration request received from the user terminal 20B in step S12B in the server storage unit 12 in association with the user terminal 20B. Is registered in the terminal table (step S13B). Further, the terminal management unit 131 of the management server 10 stores the public key OKC and software classification information included in the terminal registration request received from the user terminal 20C in step S12C in the server storage unit 12 in association with the user terminal 20C. Registered in the terminal table (step S13C). Further, the terminal management unit 131 of the management server 10 stores the public key OKX and software classification information included in the terminal registration request received from the output terminal 30 in step S12X in the server storage unit 12 in association with the output terminal 30. (Step S13X).

  This completes the operation sequence related to tool installation and terminal registration.

  Next, processing until the drawing data is distributed and output will be described. Here, as an example, first, the right is transferred from the user A who is the creator of the drawing data Fa to the user B who is the primary user, and then the right to the user C who is the secondary user from the user B. A case will be described in which the user C moves and then outputs a modeled object.

(2-2) Rights Transfer from User A (Drawing Data Creator) to User B (Primary User) FIG. 6 illustrates rights transfer from User A (drawing data creator) to User B (primary user). It is a figure which shows an example of the operation | movement sequence which concerns.

(Step S20)
First, a right transfer agreement from the user A to the user B regarding the drawing data Fa is made between the user A and the user B. Specifically, the user A makes an agreement to give the user B the right to output the drawing data Fa created by the user A N times.

(Step S21)
Next, the transaction generation unit 253 of the user terminal 20A generates a transaction TX1 when the user A inputs a condition corresponding to the content of the arrangement in step S20 via the user terminal operation unit 22 of the user terminal 20A. As shown in FIG. 10, the transaction TX1 includes control information TX1C, an input TX1in, and an output TX1out. The control information TX1C includes a transaction identifier “TX1”, a transaction classification “right generation”, and an electronic signature by the data owner (user A) (electronic signature by the private key SKA). For example, the electronic signature may be obtained by encrypting the identifier “a” of the drawing data Fa with the secret key SKA. The input TX1in includes a drawing data identifier “a” and a data owner identifier “A”. Further, the output TX1out includes the right transfer destination “B” (the address of the user terminal 20B expressed based on the public key OKB) and the number of possible outputs “N”. The contents of the transaction TX1 are not limited to the above, and may include arbitrary information such as time information (time stamp).

(Step S22)
Next, the transaction transmission unit 254 of the user terminal 20A transmits the transaction TX1 and the drawing data Fa to the management server 10. The drawing data Fa may be transmitted from the user terminal 20A to the management server 10 and stored in the server storage unit 12 at a timing before this.

  In step S21 and step S22, the processing related to generation of the transaction TX1 and transmission to the management server 10 is executed by the user terminal 20A related to the user A who is the transfer source of the drawing data right. However, these processes may be executed by the user terminal 20B related to the user B when the user B who is the transfer destination of the drawing data right holds the drawing data.

(Step S23)
Next, the transaction verification unit 132 of the management server 10 verifies the transaction TX1 received in step S22. Items to be verified include, for example, whether the designated data (drawing data Fa) is actually registered or whether the data owner has an electronic signature. However, the items to be verified are not limited to these items, and other optional items such as whether a predetermined essential item is input or whether the difference between the time information and the current time exceeds a predetermined threshold value are verified. May be included.

(Step S24)
Next, the drawing data registration unit 133 of the management server 10 stores the drawing data Fa received in step S22 in the server storage unit 12.

(Step S25)
Next, the block generation unit 134 of the management server 10 generates block 1 based on the transaction TX1.

(Step S26)
Next, the block transmission unit 135 of the management server 10 transmits the generated block 1 to the user terminals 20A and 20B.

(Steps S27A, S27B)
Next, the block processing unit 255 of the user terminal 20A verifies the received block 1 and adds it to the last block in the block chain stored in the user terminal storage unit 24 of the user terminal 20A (step S27A). Further, the block processing unit 255 of the user terminal 20B verifies the received block 1 and adds it to the last block in the block chain stored in the user terminal storage unit 24 of the user terminal 20B (step S27B).

  This completes the operation sequence related to the transfer of rights from user A (drawing data creator) to user B (primary user).

(2-3) Rights Transfer from User B (Primary User) to User C (Secondary User) FIG. 7 shows the rights transfer from User B (primary user) to User C (secondary user). It is a figure which shows an example of the operation | movement sequence which concerns.

(Step S30)
First, a right transfer agreement from the user B to the user C regarding the drawing data Fa is made between the user B and the user C. Specifically, the user B outputs the drawing data Fa M times (provided that M is a number equal to or less than N) among the rights that the drawing data Fa transferred from the user A can be output N times. An arrangement is made to give user C the right to do so.

(Step S31)
Next, the transaction generation unit 253 of the user terminal 20B generates a transaction TX2 when the user B inputs a condition corresponding to the content of the arrangement in step S30 via the user terminal operation unit 22 of the user terminal 20B. As shown in FIG. 11, the transaction TX2 includes control information TX2C, an input TX2in, and an output TX2out. The control information TX2C includes a transaction identifier “TX2”, a transaction classification “right transfer”, and a drawing data identifier “a”. Further, the input TX2in includes a transaction “TX1” to be referred to and an electronic signature of the user B (an electronic signature using the private key SKB). Further, the output TX2out includes the right transfer destination “C” (the address of the user terminal 20C expressed based on the public key OKC), and the number of possible outputs “M”. The contents of the transaction TX2 are not limited to the above, and may include arbitrary information such as time information (time stamp).

(Step S32)
Next, the transaction transmission unit 254 of the user terminal 20B transmits the transaction TX2 to the management server 10.

  In step S31 and step S32, the processing related to generation of the transaction TX2 and transmission to the management server 10 is executed by the user terminal 20A related to the user B who is the transfer source of the drawing data right. However, these processes may be executed by the user terminal 20C related to the user C who is the transfer destination of the drawing data right.

(Step S33)
Next, the transaction verification unit 132 of the management server 10 verifies the transaction TX2 received in step S32. Items to be verified include, for example, whether the referenced transaction is not already referenced, whether the block including the referenced transaction has a correct hash chain value, or the total value of the number of possible outputs included in the referenced transaction is This includes points such as whether the number of times that the transaction can be output has been reduced. However, the items to be verified are not limited to these items, and other optional items such as whether a predetermined essential item is input or whether the difference between the time information and the current time exceeds a predetermined threshold value are verified. May be included.

(Step S34)
Next, the block generation unit 134 of the management server 10 generates block 2 based on the transaction TX2.

(Step S35)
Next, the block transmission unit 135 of the management server 10 transmits the generated block 2 to the user terminals 20A and 20B, and transmits blocks 1 and 2 to the user terminal 20C.

(Steps S36A, S36B, S36C)
Next, the block processing unit 255 of the user terminal 20A verifies the received block 2 and adds it to the last block (block 1) in the block chain stored in the user terminal storage unit 24 of the user terminal 20A (step S36A). ). In addition, the block processing unit 255 of the user terminal 20B verifies the received block 2 and adds it to the last block (block 1) in the block chain stored in the user terminal storage unit 24 of the user terminal 20B (step S36B). . In addition, the block processing unit 255 of the user terminal 20C verifies the received blocks 1 and 2 and adds them to the last block in the block chain stored in the user terminal storage unit 24 of the user terminal 20C (step S36C).

  Thus, the operation sequence related to the right transfer from the user B (primary user) to the user C (secondary user) is completed.

(2-4) Output instruction to output terminal 30 by user C (secondary user) FIG. 8 is a diagram showing an example of an operation sequence related to an output instruction to output terminal 30 by user C (secondary user). It is.

(Step S40)
First, the user C determines to output the drawing data Fa using the output terminal 30. Specifically, the user C uses the right to output the drawing data Fa L times out of the right to output the drawing data Fa transferred from the user B M times, and the drawing is performed by the output terminal 30. It is decided to manufacture L solid objects based on the data Fa.

(Step S41)
Next, the transaction generation unit 253 of the user terminal 20C generates a transaction TX3 when the user C inputs a condition corresponding to the determination content of step S40 via the user terminal operation unit 22 of the user terminal 20C. As shown in FIG. 12, the transaction TX3 includes control information TX3C, an input TX3in, and an output TX3out. The control information TX3C includes a transaction identifier “TX3”, a transaction classification “right transfer”, and a drawing data identifier “a”. The input TX3in includes a transaction “TX2” to be referred to and an electronic signature of the user C (an electronic signature using the secret key SKC). Further, the output TX3out includes the right transfer destination “X” (the address of the output terminal 30 expressed based on the public key OKX) and the output possible number “L”. The contents of the transaction TX3 are not limited to the above, and may include arbitrary information such as time information (time stamp).

(Step S42)
Next, the transaction transmission unit 254 of the user terminal 20C transmits the transaction TX3 to the management server 10.

(Step S43)
Next, the transaction verification unit 132 of the management server 10 verifies the transaction TX3 received in step S42. Items to be verified include, for example, whether the referenced transaction is not already referenced, whether the block including the referenced transaction has a correct hash chain value, or the total value of the number of possible outputs included in the referenced transaction is This includes points such as whether the number of times that the transaction can be output has been reduced. However, the items to be verified are not limited to these items, and other optional items such as whether a predetermined essential item is input or whether the difference between the time information and the current time exceeds a predetermined threshold value are verified. May be included.

(Step S44)
Next, the block generation unit 134 of the management server 10 generates block 3 based on the transaction TX3.

(Step S45)
Next, the block transmission unit 135 of the management server 10 transmits the generated block 3 to the user terminals 20A, 20B, and 20C, and transmits blocks 1, 2, and 3 to the output terminal 30.

(Steps S46A, S46B, S46C, S46X)
Next, the block processing unit 255 of the user terminal 20A verifies the received block 3, and adds it to the last block (block 2) in the block chain stored in the user terminal storage unit 24 of the user terminal 20A (step S46A). ). Further, the block processing unit 255 of the user terminal 20B verifies the received block 3, and adds it to the last block (block 2) in the block chain stored in the user terminal storage unit 24 of the user terminal 20B (step S46B). . Further, the block processing unit 255 of the user terminal 20C verifies the received block 3, and adds it to the last block (block 2) in the block chain stored in the user terminal storage unit 24 of the user terminal 20C (step S46C). . The block processing unit 345 of the output terminal 40 verifies the received blocks 1, 2 and 3 and adds them to the last block in the block chain stored in the output terminal storage unit 33 of the output terminal 30 (step S46X). .

  The operation sequence related to the output instruction from the user C (secondary user) to the output terminal 30 is thus completed.

(2-5) Output by Output Terminal 30 and Output Report FIG. 9 is a diagram illustrating an example of an operation sequence related to output by the output terminal 30 and output report.

(Step S50)
First, the transaction generation unit 343 of the output terminal 30 generates the transaction TX4 when the content of the transaction TX3 included in the block 3 received in step S46X includes the right transfer to the output terminal 30. As shown in FIG. 13, the transaction TX4 includes control information TX4C, an input TX4in, an output TX4out1, and an output TX4out2. The control information TX4C includes a transaction identifier “TX4”, a transaction classification “right transfer”, and a drawing data identifier “a”. The input TX4in includes a transaction “TX3” to be referred to and an electronic signature of the output terminal 30 (an electronic signature using the secret key SKX). The output TX4out1 includes the right transfer destination 1 “A” (the address of the user terminal 20A expressed based on the public key OKA) and the output start count “1”. The output TX4out2 includes the right transfer destination 2 “X” (the address of the output terminal 30 expressed based on the public key OKX) and the output unstarted count “L−1”. The contents of the transaction TX4 are not limited to the above, and may include arbitrary information such as time information (time stamp).

(Step S51)
Next, the transaction transmission unit 344 of the output terminal 30 transmits the transaction TX4 to the management server 10.

(Step S52)
Next, the transaction verification unit 132 of the management server 10 verifies the transaction TX4 received in step S51. Items to be verified include, for example, whether the referenced transaction is not already referenced, whether the block including the referenced transaction has a correct hash chain value, or the total value of the number of possible outputs included in the referenced transaction is This includes points such as whether the number of times that the transaction can be output has been reduced. However, the items to be verified are not limited to these items, and other optional items such as whether a predetermined essential item is input or whether the difference between the time information and the current time exceeds a predetermined threshold value are verified. May be included.

(Step S53)
Next, the block generation unit 134 of the management server 10 generates a block 4 based on the transaction TX4.

(Step S54)
Next, the block transmission unit 135 of the management server 10 transmits the generated block 4 to the user terminals 20A, 20B, and 20C and the output terminal 30.

(Steps S55A, S55B, S55C, S55X)
Next, the block processing unit 255 of the user terminal 20A verifies the received block 4 and adds it to the last block (block 3) in the block chain stored in the user terminal storage unit 24 of the user terminal 20A (step S55A). ). In addition, the block processing unit 255 of the user terminal 20B verifies the received block 4 and adds it to the last block (block 3) in the block chain stored in the user terminal storage unit 24 of the user terminal 20B (step S55B). . Further, the block processing unit 255 of the user terminal 20C verifies the received block 4, and adds it to the last block (block 3) in the block chain stored in the user terminal storage unit 24 of the user terminal 20C (step S55C). . The block processing unit 345 of the output terminal 40 verifies the received block 4 and adds it to the last block (block 3) in the block chain stored in the output terminal storage unit 33 of the output terminal 30 (step S55X). .

(Step S56)
Next, the drawing data transmission unit 136 of the management server 10 performs streaming distribution of the drawing data Fa to the output terminal 30 when the content of the transaction TX4 verified in step S52 includes the right transfer to the output terminal 30.

(Step S57)
Next, the output processing unit 346 of the output terminal 30 manufactures a three-dimensional structure based on the drawing data received from the management server 10. Note that the output processing unit 346 may discard the drawing data received from the management server 10 and temporarily stored in a buffer or the like after the three-dimensional structure is manufactured.

(Step S58)
Next, the output processing unit 346 of the output terminal 30 refers to the output unstarted number included in the output 2 (output TX4out2) of the transaction generated in step S50 described above. If the output unstarted count is 1 or more, the process returns to step S50. If the output unstarted count is 0, the process ends.

  At this time, the output terminal 30 generates a transaction TX (n + 1) referring to the transaction TXn generated last time by the output terminal 30 in the second and subsequent steps S50. As shown in FIG. 14, the transaction TX (n + 1) includes control information TX (n + 1) C, an input TX (n + 1) in, and an output TX (n + 1) out1. The control information TX (n + 1) C includes a transaction identifier “TX (n + 1)”, a transaction classification “right transfer”, and a drawing data identifier “a”. The input TX (n + 1) in includes a transaction “TXn” to be referred to and an electronic signature of the output terminal 30 (an electronic signature using the secret key SKX). The output TX (n + 1) out1 includes the right transfer destination 1 “A” (the address of the user terminal 20A expressed based on the public key OKA) and the output start count “1”.

  Further, when the transaction TX (n + 1) is generated in step S50 from the second time to the (L−1) th time, the transaction TX (n + 1) further includes an output TX (n + 1) out2, as shown in FIG. The output TX (n + 1) out2 includes the right transfer destination 2 “X” (the address of the output terminal 30 expressed based on the public key OKX), and the output unstarted count “transaction TXn output unstarted count−1”. . On the other hand, when the transaction TX (n + 1) is generated in the L-th step S50, the output TX (n + 1) out2 may not be included unlike FIG. The contents of the transaction TX (n + 1) are not limited to the above, and may include arbitrary information such as time information (time stamp).

  Thus, the operation sequence related to the output and output report by the output terminal 30 is completed.

  As described above, in the present embodiment, the content data is stored in the storage unit included in the server device, and is transmitted to the output terminal only when the output terminal is designated as the content data transfer destination in the transaction. . Therefore, high security is maintained for the content data. And the transaction reception part of a server apparatus can receive the transaction which concerns on content data. Therefore, it is possible to easily grasp the status of transfer and use of rights related to content data.

  In the present embodiment, a transaction (transaction TX4 or transaction TX (n + 1)) is generated every time the three-dimensional object is manufactured once by the output terminal 30. Then, the management server 10 generates a block based on the transaction, and transmits the block to each user terminal and each output terminal of the content data management system 1. Thereby, whenever drawing data Fa is utilized and a three-dimensional molded item is manufactured, management server 10, each user terminal, each output terminal, etc. grasp that drawing data Fa was used by a transaction or a block. It becomes possible. Therefore, each node of the content data management system 1 can manage in detail the number of times the content data such as the drawing data Fa is used.

  In addition, it is not only the structure which produces | generates a transaction every time it manufactures the three-dimensional molded object mentioned above, but manufactures a three-dimensional molded article collectively by the frequency | count (for example, L times) shown as the output possible number in transaction TX3. After that, a configuration may be adopted in which a transaction is generated. That is, the management server 10 performs streaming delivery of the drawing data Fa to the output terminal 30 by the number of times (for example, L times) indicated as the number of times that can be output included in the transaction TX3. When the output terminal 30 starts manufacturing the three-dimensional modeled object for the number of times (for example, L times), for example, the output terminal 30 generates a transaction TX4 'as shown in FIG. As shown in FIG. 15, the transaction TX 4 ′ includes an output TX 4 out 1 ′ in which the right transfer destination 1 is “A” and the number of output times is “L”. Then, the management server 10 performs verification of the transaction TX4 ', generation of a block, transmission, and the like. According to this configuration, since the number of transaction generations can be reduced, the processing speed is improved.

  The present invention is not limited to the above-described embodiment, and can be implemented in various other forms without departing from the gist of the present invention. For this reason, the said embodiment is only a mere illustration in all points, and is not interpreted limitedly. For example, the above-described processing steps can be arbitrarily changed in order as long as the processing contents do not contradict each other, or can be executed in parallel. Moreover, you may add another step between each process step. In addition, a step described as one step may be executed by being divided into a plurality of steps, or what is described by being divided into a plurality of steps can be grasped as one step.

  DESCRIPTION OF SYMBOLS 1 ... Content data management system 1, 10 ... Management server, 11 ... Server communication part, 12 ... Server memory | storage part, 13 ... Server processing part, 131 ... Terminal management part, 132 ... Transaction verification part, 133 ... Drawing data registration part, 134: Block generation unit, 135: Block transmission unit, 136: Drawing data transmission unit, 20A, 20B, 20C ... User terminal, 21 ... User terminal communication unit, 22 ... User terminal operation unit, 23 ... User terminal display unit, 24 ... User terminal storage unit, 25 ... User terminal processing unit, 251 ... Key generation unit, 252 ... Terminal registration request unit, 253 ... Transaction generation unit, 254 ... Transaction transmission unit, 255 ... Block processing unit, 30 ... Output terminal, 31 ... output terminal communication unit, 32 ... output unit, 33 ... output terminal storage unit, 34 ... output terminal processing unit, 341 ... key generation unit, 42 ... terminal registration request unit, 343 ... transaction generation unit 344 ... transaction transmission section, 345 ... block processor, 346 ... output processor

Claims (8)

A content data management system comprising a server device sharing a block chain formed by concatenating blocks generated based on a transaction including information on content data transactions, a user terminal, and an output terminal,
The user terminal is
A first transaction generation unit that generates a first transaction including information related to the transfer of an unused amount of the right to output content data;
A first transaction transmitter that transmits the first transaction to the server device;
The output terminal is
A second transaction generation unit that generates a second transaction including information related to transfer of a used amount of the right to output the content data;
A second transaction transmitter for transmitting the second transaction to the server device,
The server device
A content data storage unit for storing content data;
A verification unit that verifies the first transaction received from the user terminal or the second transaction received from the output terminal;
A block generator for generating a block based on the verified first transaction or the second transaction;
A block transmitter for transmitting the block to the user terminal and the output terminal;
In the verified first transaction or second transaction, when an output terminal is designated as a transfer destination for which the right to output the content data is not used , the content data is transmitted to the output terminal. A content data transmission unit,
The output terminal further includes:
A content data management system comprising: an output processing unit that outputs content related to the content data received from the content data transmission unit. The user terminal further includes:
A first storage unit for storing the block chain;
A first block processing unit that connects the block received from the server device to the block chain stored in the first storage unit,
The output terminal further includes:
A second storage unit for storing the block chain;
The content data management system according to claim 1, further comprising: a second block processing unit that connects the block received from the server device to the block chain stored in the second storage unit. The user terminal further includes:
A first key generation unit that generates a pair of a first secret key and a first public key;
A first electronic signature unit that electronically signs the first transaction generated by the first transaction generation unit using the first secret key;
The output terminal further includes:
A second key generation unit for generating a pair of a second secret key and a second public key;
A second electronic signature unit that electronically signs the second transaction generated by the second transaction generation unit using the second secret key;
The verification unit included in the server device includes:
Verifying the first transaction received from the user terminal using the first public key received from the user terminal;
The content data management system according to claim 1 or 2, wherein the second transaction received from the output terminal is verified using the second public key received from the output terminal.   The content data transmission unit included in the server device transmits the content data to the output terminal as many times as specified in the first transaction or the second transaction. Content data management system described in 1.   The output processing unit included in the output terminal discards the content data received and temporarily stored from the content data transmission unit after outputting the content. The content data management system described. A server device connected via a communication network to a user terminal and an output terminal that share a block chain formed by concatenating blocks generated based on a transaction including information on content data transactions,
A content data storage unit for storing content data;
Wherein a first transaction received from the user terminal, the first transaction including information relating to available which do not result in partial transfer of the right to output the content data, or a second transaction received from the output terminal a verification unit for verifying the second transaction includes information relating to the utilized minute transfer of the right to output the content data,
A block generator for generating a block based on the verified first transaction or the second transaction;
A block transmitter for transmitting the block to the user terminal and the output terminal;
In the verified first transaction or second transaction, when an output terminal is designated as a transfer destination for which the right to output the content data is not used , the content data is transmitted to the output terminal. And a content data transmission unit. A control method for a server connected to a user terminal and an output terminal via a communication network that share a block chain formed by concatenating blocks generated based on a transaction including information on content data transactions,
The server device includes a content data storage unit that stores content data,
The server device is
Wherein a first transaction received from the user terminal, the first transaction including information relating to available which do not result in partial transfer of the right to output the content data, or a second transaction received from the output terminal a step of verifying the second transaction includes information relating to the utilized minute transfer of the right to output the content data,
Generating a block based on the verified first transaction or the second transaction;
Transmitting the block to the user terminal and the output terminal;
In the verified first transaction or second transaction, when an output terminal is designated as a transfer destination for which the right to output the content data is not used , the content data is transmitted to the output terminal. And a control method including steps. A control program for a server device connected via a communication network to a user terminal and an output terminal that share a block chain formed by concatenating blocks generated based on a transaction including information on content data transactions,
The server device includes a content data storage unit that stores content data,
In the server device,
Wherein a first transaction received from the user terminal, the first transaction including information relating to available which do not result in partial transfer of the right to output the content data, or a second transaction received from the output terminal a step of verifying the second transaction includes information relating to the utilized minute transfer of the right to output the content data,
Generating a block based on the verified first transaction or the second transaction;
Transmitting the block to the user terminal and the output terminal;
In the verified first transaction or second transaction, when an output terminal is designated as a transfer destination for which the right to output the content data is not used , the content data is transmitted to the output terminal. And a control program for executing the steps.

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