Content management device, content management method, program, and storage medium

Abstract

The objective is to provide technology that ensures proper rights management for derivative works created using digital content. [Solution] One aspect of the present disclosure relates to a content management device comprising: a receiving unit that receives digital content and content data; a data management unit that manages the content data; a license management unit that generates a certificate including rights history based on the content data and assigns the certificate to the digital content; and an output unit that outputs the digital content to which the certificate has been assigned in association with license information.

Description

【Technical Field】 , , 【0007】 , 【0001】 The present disclosure relates to a content management apparatus, a content management method, a program, and a storage medium. 【Background Art】 【0002】 Secondary creative works that use primary creative works such as original artworks as components, and n - th creative works resulting from the chain of creators are spreading worldwide. Some n - th creative works are in circulation in the market, but there may potentially be content that cannot be sold without license processing. 【0003】 Conventionally, technologies for preventing unauthorized use of digital content such as images, audio, video, 3 - dimensional (3D) data, etc. have been proposed. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid - Open No. 2024 - 97350 【Patent Document 2】 Japanese Patent No. 7336011 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 However, the conventional technology focuses on preventing unauthorized use of the rights of the content holder of the original content with respect to secondary creative works, and a method for appropriately securing the rights of n - th creative works such as tertiary creative works created using secondary creative works is required. 【0006】 In view of the above problems, an object of the present disclosure is to provide a technology for securing an appropriate rights relationship for n - th creative works created using digital content. 【Means for Solving the Problems】 【0007】 One aspect of this disclosure relates to a content management device comprising: a receiving unit for receiving digital content and content data; a data management unit for managing the content data; a license management unit for generating a certificate including rights history based on the content data and assigning the certificate to the digital content; and an output unit for outputting the digital content to which the certificate has been assigned, in association with license information. [Effects of the Invention] 【0008】 According to this disclosure, we can provide technology to ensure proper rights relationships for derivative works created using digital content. [Brief explanation of the drawing] 【0009】 [Figure 1] Figure 1 is a schematic diagram showing the nth derivative work of digital content according to one embodiment of the present disclosure. [Figure 2] Figure 2 is a schematic diagram showing a content management process according to one embodiment of the present disclosure. [Figure 3] Figure 3 is a schematic diagram showing digital content with embedded credentials according to one embodiment of the present disclosure. [Figure 4] Figure 4 is a block diagram showing the hardware configuration of a content management device according to one embodiment of the present disclosure. [Figure 5] Figure 5 is a block diagram showing the functional configuration of a content management device according to one embodiment of the present disclosure. [Figure 6] Figure 6 shows the data structure of content data according to one embodiment of the present disclosure. [Figure 7] Figure 7 is a sequence diagram showing a content registration process according to one embodiment of the present disclosure. [Figure 8] Figure 8 is a sequence diagram showing a content registration process according to another embodiment of the present disclosure. [Figure 9] Figure 9 is a sequence diagram showing a license purchase process according to one embodiment of the present disclosure. [Figure 10] FIG. 10 is a sequence diagram showing the creative content registration process according to an embodiment of the present disclosure. [Figure 11] FIG. 11 is a sequence diagram showing the license purchase process of creative content according to an embodiment of the present disclosure. [Figure 12] FIG. 12 is a diagram showing the data structure of various data and information according to an embodiment of the present disclosure. 【Mode for Carrying Out the Invention】 【0010】 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. 【0011】 In the following embodiments, a content management apparatus is disclosed that distributes content while ensuring the rights of each rights holder of an nth-degree creative work. 【0012】 [Outline of the Present Disclosure] As shown in FIG. 1, after digital content such as images, videos, audio, and 3D data is created by a content holder 50 who is a primary creator, it can be used to create subsequent nth-degree creative works such as secondary creative works 60. 【0013】 When the content management apparatus 100 according to the following embodiments receives digital content and content data related to the digital content, based on the content data, it generates a certificate (for example, credentials, etc.) including the rights history of each rights holder from the primary creator to the nth-degree creator, attaches the generated certificate to the digital content, and outputs the digital content to which the certificate is attached. 【0014】 For example, as shown in FIG. 2, when creating image content, the content holder 50 transmits a registration application for registering the image content in a content database (DB) together with content data related to the image content (for example, content holder name, content ID, number of licenses, creatable range, free description, etc.) to the content management apparatus 100. 【0015】 When the content management device 100 receives a registration application from the content holder 50, it first executes a duplicate check to determine whether the registered image content has already been registered in the content DB. If the image content is not registered in the content DB, the content management device 100 executes a content registration process to register the image content in the content DB and obtains the image content with credentials. The credentials may include the content holder name, content ID, number of licenses, creatable range, free description, and the like. Further, the content management device 100 may create license information based on the content data and hold the created license information by itself, or store it in the blockchain. 【0016】 Next, the secondary creator 60 who desires to reuse the image content registered in the content DB requests the content management device 100 to purchase a license for the image content. When receiving the license purchase request from the secondary creator 60, the content management device 100 attaches a digital watermark for accessing the license information to the image content, and provides the secondary creator 60 with the image content with the digital watermark and credentials, and a creation license for using the image content. 【0017】 Next, when creating secondary creation image content using the licensed image content, the secondary creator 60 sends a registration application for registering the secondary creation image content in the content database (DB) to the content management device 100 together with the content data related to the secondary creation image content. 【0018】 Upon receiving a registration application from a derivative creator 60, the content management device 100 first performs a duplicate check to determine whether the requested derivative image content is already registered in the content database. If the derivative image content is not registered in the content database, the content management device 100 performs a content registration process to register the derivative image content in the content database and obtains the derivative image content with credentials. These credentials may include the content holder name, content ID, creator information, and free-form text. The content management device 100 may also create license information based on the content data and either retain the created license information itself or store it on the blockchain. 【0019】 Next, a derivative creator 70 who wishes to make tertiary use of derivative image content registered in the content database requests the content management device 100 to purchase a license for the derivative image content. Upon receiving the license purchase request from the derivative creator 70, the content management device 100 adds a digital watermark to the requested derivative image content to access the license information, and provides the derivative image content with the digital watermark and credentials, along with a creative license for using the derivative image content, to the derivative creator 70. 【0020】 Here, the credentials according to the embodiments described later may have a rights history that includes information from the content holder of the digital content to the nth derivative creator after permission to use the digital content was granted. For example, credentials for a tertiary derivative image content may include a rights history as shown in Figure 3. That is, the credentials may be configured to include rights holder information of the content holder 50, rights holder information of the derivative creator 60, and rights holder information of the tertiary creator 70. 【0021】 This makes it possible to grant appropriate rights to both the content holder 50 and the creators of derivative works, not only for the original image content but also for derivative works of the same type. 【0022】 Here, the content management device 100 may have a hardware configuration such as that shown in Figure 4. Specifically, the content management device 100 includes an interface device 101, a storage device 102, a memory device 103, a processor 104, a user interface (UI) device 105, and a communication device 106, all interconnected via bus B. 【0023】 Programs and / or data that implement various functions and processes in the content management device 100 are downloaded from an external device and / or network to the storage device 102 or memory device 103 via the interface device 101. 【0024】 The storage device 102 is implemented using non-volatile memory or the like, and stores installed or downloaded programs or data (e.g., files). 【0025】 The memory device 103 is implemented using random access memory, static memory, etc., and when a program or instruction is activated, it reads the program or instruction, data, etc. from the storage device 102 and stores it. The storage device 102, the memory device 103, and the removable storage medium may be collectively referred to as a non-transitory storage medium. 【0026】 The processor 104 may be implemented by one or more CPUs (Central Processing Units), GPUs (Graphics Processing Units), processing circuits, etc., which may consist of one or more processor cores, and executes various functions and processes of the content management device 100 according to data such as programs, instructions, and parameters necessary to execute said programs or instructions stored in the memory device 103. 【0027】 The user interface (UI) device 105 may consist of input devices such as a keyboard, mouse, camera, and microphone, output devices such as a display, speaker, headset, and printer, and input / output devices such as a touch panel, and realizes an interface between the user and the content management device 100. For example, the user may operate the content management device 100 by operating a GUI (Graphical User Interface) displayed on the display or touch panel with a keyboard, mouse, etc. 【0028】 The communication device 106 is implemented by various communication circuits that perform wired and / or wireless communication processing with external devices, the Internet, LAN (Local Area Network), cellular networks, and other communication networks. 【0029】 However, the hardware configuration described above is merely an example, and the content management device 100 according to this disclosure may be implemented by any other suitable hardware configuration. 【0030】 [Content management device] A content management device 100 according to one embodiment of the present disclosure will be described. Figure 5 is a block diagram showing the functional configuration of the content management device 100 according to one embodiment of the present disclosure. As shown in Figure 5, the content management device 100 has a reception unit 110, a data management unit 120, a license management unit 130, and an output unit 140. For example, one or more of the reception unit 110, data management unit 120, license management unit 130, and output unit 140 may be realized by one or more processors 104 executing one or more programs or instructions. 【0031】 The reception unit 110 receives digital content and content data. For example, when a content holder 50 creates digital content such as images, videos, audio, or 3D data and registers the created digital content in the content database, the reception unit 110 obtains the digital content to be registered, along with the content data related to that digital content, from the content holder 50. 【0032】 The content data here may consist of, for example, the content holder name, content ID, number of licenses, scope of creation, and free text. That is, the content holder name may be the name or designation of content holder 50. The content ID may be any identifying information that identifies the content to be registered. The number of licenses may indicate the number of licenses that are permitted to be issued for the content to be registered. The scope of creation may indicate the scope of creation permitted by n derivative creators for the content to be registered. The free text may be text that content holder 50 can freely write. 【0033】 Furthermore, when a derivative creator who is permitted to use the original digital content creates a derivative work of the digital content and registers the derivative work in the content database, the reception unit 110 obtains the derivative work from the derivative creator along with the content data related to the derivative work. 【0034】 The content data here may consist of, for example, the content holder name, content ID, number of licenses, scope of creation, and free text mentioned above, as well as the information of the nth derivative creator and the license ID. The information of the nth derivative creator may be the name or title of the nth derivative creator. The license ID may be identification information that identifies the license issued to the nth derivative creator. 【0035】 In one embodiment, the receiving unit 110 may determine whether the received digital content is already registered in the content database. Specifically, the receiving unit 110 determines whether the digital content to be registered is already registered in the content database, that is, it performs a duplicate check. For example, the receiving unit 110 calculates the ISCC (International Standard Content Code) value of the digital content to be registered and compares it with the ISCC value of the digital content registered in the content database. If the error between the ISCC value of the digital content to be registered and the ISCC value of the already registered digital content is less than or equal to a predetermined threshold, the receiving unit 110 may determine that the digital content to be registered is already registered. On the other hand, if the error between the ISCC value of the digital content to be registered and the ISCC value of the already registered digital content is greater than a predetermined threshold, the receiving unit 110 may determine that the digital content to be registered is not registered. 【0036】 If the reception unit 110 determines that the digital content to be registered has already been registered, it may notify the content holder 50 or the nth derivative creator that the digital content cannot be registered, or it may notify the operator of the content management device 100. On the other hand, if the reception unit 110 determines that the digital content to be registered has not been registered, it stores the received digital content in the content DB and transmits the received content data to the data management unit 120. 【0037】 The data management unit 120 manages the content data. Specifically, the data management unit 120 stores and manages the content data acquired from the reception unit 110. For example, the data management unit 120 may store and manage the content data using a data structure as shown in Figure 6. 【0038】 In the example data structure shown in Figure 6, the content data holds the content holder name, content ID, number of licenses, scope of creation, and free description, which are data items of the content data received by the reception unit 110, along with blockchain access information for accessing license information stored on the blockchain. However, the data items of the content data as disclosed herein are not limited to these, and any other data items may be used for the content data. 【0039】 Furthermore, when permission is granted for derivative works of the digital content, the data management unit 120 updates the content data for that digital content accordingly. For example, the data management unit 120 may add the information of the derivative creator, the license ID, etc., to the content data. 【0040】 Furthermore, the data management unit 120 may register license information based on content data on the blockchain. Here, the license information is the information necessary for licensing derivative works using the digital content, and may consist of, for example, the content holder name, information of the derivative creator, content ID, number of licenses, license ID, scope of creation, and free description. 【0041】 Then, the data management unit 120 provides the license management unit 130 with the information necessary for the license management unit 130 to issue licenses and certificates, based on the content data it manages, as certificate generation information. 【0042】 The license management unit 130 generates a certificate including rights history based on content data and assigns the certificate to the digital content. Specifically, upon obtaining certificate generation information created based on content data from the data management unit 120, the license management unit 130 issues a license to the original digital content or the nth derivative digital content based on the obtained certificate generation information, and embeds the certificate in the licensed digital content. 【0043】 The certificate may include information from the content holder 50 of the digital content to the nth derivative creators who have been permitted to use the digital content. Specifically, the rights holder information for each of the n derivative digital content creators from the content holder 50 of the original digital content may be encoded in the certificate. 【0044】 Furthermore, if license information is stored on the blockchain, the license management unit 130 may issue a token associated with the digital content to access the blockchain. This allows, for example, if a certificate embedded in the digital content cannot be decrypted due to loss or malfunction, the derivative creator can use the token, which is blockchain access information associated with the digital content, to access the license information registered on the blockchain. 【0045】 Furthermore, if license information is managed by the data management unit 120 rather than on the blockchain, the license management unit 130 may affix a digital watermark to the digital content to access the license information. This allows, for example, if a certificate embedded in the digital content cannot be decrypted due to loss or malfunction, a derivative creator can use the digital watermark embedded in the digital content to access the license information registered in the data management unit 120. 【0046】 Once the certificate and / or watermark is embedded in the digital content, the license management unit 130 provides the digital content with the embedded certificate and / or watermark to the output unit 140. 【0047】 The output unit 140 outputs digital content to which a certificate has been attached, in association with license information. Specifically, the output unit 140 provides the licensed creator with digital content to which the certificate has been embedded or digital content created from derivative works. Upon obtaining the digital content to which the certificate has been attached, the creator can use the acquired digital content to create further works. 【0048】 According to the content management device 100, it becomes possible to grant appropriate rights to each rights holder, including the content holder 50 and the creators of derivative works, not only for the original image content but also for derivative works of the same name. 【0049】 [Content registration process] Figure 7 is a sequence diagram showing a content registration process according to one embodiment of the present disclosure. In the following embodiment, the content management device 100 described above may be implemented by multiple servers. 【0050】 First, when a content holder 50 registers digital content in the content database, a content registration process is performed for that digital content. Specifically, upon receiving a registration request for digital content from the content holder 50, a duplicate check is performed on the digital content to determine whether registration is possible. Then, content data related to the digital content is stored and managed, and a certificate created based on the content data is attached to the digital content. 【0051】 As shown in Figure 7, in step S101, the content holder 50 sends a registration application to the server management system 200 that includes the digital content and the content data associated with the digital content. 【0052】 In step S102, the server management system 200 performs a duplicate check on the received digital content. For example, the server management system 200 calculates the ISCC value of the received digital content and determines whether the digital content is already registered in the content database based on the calculated ISCC value. If it determines that the digital content is not already registered, the server management system 200 registers the digital content in the content database. 【0053】 In step S103, the server management system 200 sends content data to the data management server 400. 【0054】 In step S104, the server management system 200 sends the digital content to the license management server 300. 【0055】 In step S105, the data management server 400 registers content data. For example, the content data may include the content holder name, content ID, number of licenses, scope of creation, and / or free-form text. 【0056】 In step S106, the data management server 400 transmits license information to the license management server 300. The license information includes the information necessary to create a certificate and may be generated based on the content data. For example, the content holder name, content ID, number of licenses, scope of creation, and / or free text may be shown in the license information. 【0057】 In step S107, the license management server 300 creates a certificate based on the license information and assigns the created certificate to the digital content. The license management server 300 then stores the digital content to which the certificate has been assigned in the content database. 【0058】 Figure 8 is a sequence diagram showing a content registration process according to another embodiment of the present disclosure. The content management device 100 described above may be implemented by one or more servers. 【0059】 In the embodiment shown in Figure 8, first, when a content holder 50 registers digital content in the content database, a content registration process is performed for that digital content. Specifically, upon receiving a registration request for digital content from the content holder 50, a duplicate check is performed on the digital content to determine whether registration is possible. Then, content data related to the digital content is stored and managed, and license information created based on the content data is stored in the blockchain 500. Finally, a certificate created based on the content data is attached to the digital content. 【0060】 As shown in Figure 8, in step S201, the content holder 50 sends a registration application to the server management system 200 that includes the digital content and the content data associated with the digital content. 【0061】 In step S202, the server management system 200 performs a duplicate check on the received digital content. For example, the server management system 200 calculates the ISCC value of the received digital content and determines whether the digital content is already registered in the content database based on the calculated ISCC value. If it determines that the digital content is not already registered, the server management system 200 registers the digital content in the content database. 【0062】 In step S203, the server management system 200 sends content data to the data management server 400. 【0063】 In step S204, the server management system 200 sends the digital content to the license management server 300. 【0064】 In step S205, the data management server 400 registers content data. For example, the content data may include the content holder name, content ID, number of licenses, scope of creation, and / or free-form text. 【0065】 In step S206, the data management server 400 transmits license information to the blockchain 500. The license information includes information necessary to create a certificate and may be generated based on content data. For example, the content holder name, content ID, number of licenses, scope of creation, and / or free text may be shown in the license information. 【0066】 In step S207, blockchain 500 registers the license information. 【0067】 In step S208, blockchain 500 sends blockchain access information to data management server 400 to access registered license information. 【0068】 In step S209, the data management server 400 updates the content data based on the received blockchain access information. 【0069】 In step S210, the data management server 400 sends license information to the license management server 300. 【0070】 In step S211, the license management server 300 creates a certificate based on the license information and assigns the created certificate to the digital content. Then, the license management server 300 stores the digital content to which the certificate has been assigned in the content database. 【0071】 [License purchase process] Figure 9 is a sequence diagram showing a license purchase process according to one embodiment of the present disclosure. Note that the content management device 100 described above may be implemented by one or more servers. 【0072】 In the embodiment shown in Figure 9, a license purchase process is performed for the digital content in order to obtain a license that allows a derivative creator (more generally, an nth derivative creator) to use the digital content for derivative works. Specifically, when a license purchase application for the digital content is received from a derivative creator 60, the license purchase process is performed. The creator information of the derivative creator 60 and the content data are then stored and managed. The creator information and license information are then added to the certificate attached to the digital content, and a digital watermark is added to the digital content to allow access to the license information. 【0073】 As shown in Figure 9, in step S301, the derivative creator 60 sends a license purchase application for the digital content to the server management system 200. This license purchase application may include the creator information of the derivative creator 60 (e.g., creator name). 【0074】 In step S302, the server management system 200 sends a license issuance application for the digital content to the data management server 400. This license issuance application may include creator information of the derivative creator 60. 【0075】 In step S303, the data management server 400 performs a determination of whether or not a license can be issued. Specifically, the data management server 400 checks if there are remaining licenses by referring to the content data of the digital content. If there are remaining licenses, the data management server 400 determines that a license can be issued for the digital content and decrements the remaining license count in the content data. 【0076】 In step S304, the license management server 300 sends creator information and license information necessary for issuing a license to the license management server 300. 【0077】 In step S305, the license management server 300 issues a license for the digital content. 【0078】 In step S306, the license management server 300 sends the license ID of the issued license to the data management server 400. 【0079】 In step S307, the data management server 400 updates the content data using the acquired creator information and license ID. 【0080】 In step S308, the license management server 300 updates the contents of the certificate attached to the digital content. Specifically, creator information of the licensed derivative creators 60 may be added to the certificate. 【0081】 In step S309, the license management server 300 affixes a digital watermark to the digital content to access the license information of the digital content. Using this digital watermark, the derivative creator 60 can refer to the license information registered in the data management server 400 or the blockchain 500. 【0082】 In step S310, the license management server 300 sends the updated certificate and the digital content with the embedded digital watermark to the server management system 200. 【0083】 In step S311, the server management system 200 provides the derivative creator 60 with the updated certificate and digital watermark embedded in the digital content. 【0084】 [Creative Content Registration Process] Figure 10 is a sequence diagram showing the creative content registration process according to one embodiment of the present disclosure. The content management device 100 described above may be implemented by one or more servers. 【0085】 In the embodiment shown in Figure 10, when a derivative creator 60 registers digital content created by that creator in the content database, a creative content registration process is performed for that digital content. Specifically, when a registration application for the created digital content is received from the derivative creator 60, a duplicate check is performed on the digital content to determine whether or not it can be registered. Then, content data related to the digital content is stored and managed, and a certificate created based on the content data is attached to the created digital content. 【0086】 As shown in Figure 10, in step S401, the derivative creator 60 sends a registration application to the server management system 200 that includes the digital content he created and the content data related to the digital content. 【0087】 In step S402, the server management system 200 performs a duplicate check on the received digital content. For example, the server management system 200 calculates the ISCC value of the received digital content and determines whether the digital content is already registered in the content database based on the calculated ISCC value. If it determines that the digital content is not already registered, the server management system 200 registers the digital content in the content database. 【0088】 In step S403, the server management system 200 sends content data to the data management server 400. 【0089】 In step S404, the server management system 200 transmits the created digital content to the license management server 300. 【0090】 In step S405, the data management server 400 updates the content data. For example, the content data may be updated to include creator information and license IDs of derivative creators 60. 【0091】 In step S406, the data management server 400 sends license information to the license management server 300. The license information includes information necessary to renew the certificate and may be generated based on the content data. For example, creator information, license ID, etc., may be shown in the license information. 【0092】 In step S407, the license management server 300 updates the certificates attached to the digital content based on the license information. The license management server 300 then stores the digital content with the updated certificates in the content database. 【0093】 [License purchase process for creative content] Figure 11 is a sequence diagram showing the license purchase process for creative content according to one embodiment of the present disclosure. The content management device 100 described above may be implemented by one or more servers. 【0094】 In the embodiment shown in Figure 11, a license purchase process is performed for the digital content in order to obtain a license that allows a tertiary creator (more generally, an nth-generation creator) to use the derivative digital content for further derivative works. Specifically, when a license purchase application for the digital content is received from the tertiary creator 70, the license purchase process is executed. The creator information and content data of the tertiary creator 70 are then stored and managed. The creator information and license information are added to the certificate attached to the digital content, and a digital watermark is added to the digital content to allow access to the license information. 【0095】 As shown in Figure 11, in step S501, the derivative creator 70 sends a license purchase request for the derivative digital content to the server management system 200. This license purchase request may include the creator information of the derivative creator 70 (e.g., creator name). 【0096】 In step S502, the server management system 200 sends a license issuance application for the digital content to the data management server 400. This license issuance application may include creator information of the derivative creator 70. 【0097】 In step S503, the data management server 400 performs a determination of whether or not a license can be issued. Specifically, the data management server 400 checks if there are remaining licenses by referring to the content data of the digital content. If there are remaining licenses, the data management server 400 determines that a license can be issued for the digital content and decrements the remaining license count in the content data. 【0098】 In step S504, the license management server 300 sends creator information and license information necessary for issuing a license to the license management server 300. 【0099】 In step S505, the license management server 300 issues a license for the digital content. 【0100】 In step S506, the license management server 300 sends the license ID of the issued license to the data management server 400. 【0101】 In step S507, the data management server 400 updates the content data using the acquired creator information and license ID. 【0102】 In step S508, the license management server 300 updates the contents of the certificate attached to the digital content. Specifically, creator information of the licensed derivative creators 70 may be added to the certificate. 【0103】 In step S509, the license management server 300 affixes a digital watermark to the digital content to access the license information of the digital content. Using this digital watermark, the derivative creator 70 can refer to the license information registered in the data management server 400 or the blockchain 500. 【0104】 In step S510, the license management server 300 sends the updated certificate and the digital content with the embedded digital watermark to the server management system 200. 【0105】 In step S511, the server management system 200 provides the derivative creator 70 with the updated certificate and digitally watermarked digital content. 【0106】 Here, the various data and information described above may have a data structure such as that shown in Figure 12. As shown in the figure, the license information stored in blockchain 500 may include data items such as the content holder name, content ID, number of licenses, and scope of creation. 【0107】 Furthermore, content holder information may include data items such as content holder name, content ID, ISCC value, blockchain access information, number of licenses, scope of creation, and free-text fields. 【0108】 Furthermore, creator information may include content holder name, content ID, ISCC value of the created content, creator information, license ID, blockchain access information, and free-text data items. 【0109】 Furthermore, the license purchaser information pertains to the purchaser of a license that permits the creation of original digital content or derivative digital content, and may include creator information and license ID data items. 【0110】 Furthermore, the creative content purchaser information pertains to purchasers of original digital content or derivative digital content, and may include data items such as purchaser information and purchase certificate ID. In other words, the purchaser does not create anything from the original digital content or derivative digital content, but rather enjoys or otherwise consumes the original digital content or derivative digital content. 【0111】 Furthermore, the license credentials may include data items such as the content holder name, content ID, blockchain access information, scope of creation, creator information, and license ID. 【0112】 Furthermore, the credentials for creative content may include the content holder name, content ID, creator information, buyer information, purchase certificate ID, blockchain access information, and free-text data items. 【0113】 Furthermore, this information can be used in relation to each other. 【0114】 According to the content management process described above, it becomes possible to grant appropriate rights to each rights holder, including the content holder 50 and the creators of derivative works, not only for the original digital content but also for derivative works created from it. 【0115】 Although embodiments of this disclosure have been described in detail above, this disclosure is not limited to the specific embodiments described above, and various modifications and changes are possible within the scope of the gist of this disclosure as described in the claims. [Explanation of symbols] 【0116】 100 Content Management Devices 110 Reception Department 120 Data Management Department 130 License Management Department 140 Output section

Claims

[Claim 1] A reception desk that accepts digital content and content data, A data management unit that manages the aforementioned content data, A license management unit generates a certificate including rights history based on the aforementioned content data and assigns the certificate to the digital content, An output unit that outputs digital content to which the aforementioned certificate has been assigned, in association with license information, A content management device having the following features. [Claim 2] The content management device according to claim 1, wherein the receiving unit determines whether the received digital content has already been registered in the content database. [Claim 3] The content management device according to claim 1, wherein the data management unit registers license information based on the content data on the blockchain. [Claim 4] The content management device according to claim 3, wherein the license management unit issues tokens for accessing the blockchain in association with the digital content. [Claim 5] The content management device according to claim 1, wherein the license management unit provides a digital watermark for accessing the license information. [Claim 6] The content management device according to claim 1, wherein the rights history includes information from the creator of the digital content to the creator after permission was granted to use the digital content. [Claim 7] Accepting digital content and content data, Managing the aforementioned content data, The process involves generating a certificate containing rights history based on the aforementioned content data, and assigning the certificate to the aforementioned digital content. Outputting the digital content to which the certificate has been assigned, in association with the aforementioned content data, A content management method that a computer uses. [Claim 8] Accepting digital content and content data, Managing the aforementioned content data, The process involves generating a certificate containing rights history based on the aforementioned content data, and assigning the certificate to the aforementioned digital content. Outputting the digital content to which the certificate has been assigned, in association with the aforementioned content data, A program that causes a computer to execute something. [Claim 9] Digital content and, A certificate including a rights history generated based on the content data of the aforementioned digital content, A storage medium having the following characteristics.

Images