Right-holder terminal, user terminal, and content usage method

A user terminal configured to be used by a user of content and to transmit permission request data for the content to a right holder of the content, wherein

• data of the content is registered in a file management system;
• the user terminal comprising:
• a registration unit, including one or more processors, configured to register, in a distributed ledger, an identifier of the user in the file management system as a valid user of the content, wherein the identifier of the user is registered in association with an identifier of the content in the distributed ledger;
• a permission request transmitting unit, including one or more processors, configured to transmit the permission request data for the content including the identifier of the user via the file management system;
• and
• a content usage unit, including one or more processors, configured to receive, from the file management system, permission data for permitting a use of the content by the user and use the content, if it is verified in a terminal of the right holder that the identifier of the user registered in the distributed ledger as a valid user of the content corresponds to the identifier of the user included in the permission request data.

A content usage method used for a content usage system comprising a right-holder terminal that is used by a right holder of the content and transmits permission data for the content to a user of the content, and a user terminal that is used by the user of the content and transmits permission request data for the content to the right holder of the content, wherein

• data of the content is registered in a file management system;
• the content usage method comprising:
• registering, by the user terminal, in a distributed ledger, an identifier of the user in the file management system as a valid user of the content, wherein the identifier of the user is registered in association with an identifier of the content in the distributed ledger;
• transmitting, by the user terminal, the permission request data for the content including the identifier of the user via the file management system;
• receiving, by the right-holder terminal, from the file management system, the permission request data for the content including the identifier of the user;
• verifying, by the right-holder terminal, that the identifier of the user registered in the distributed ledger as a valid user of the content corresponds to the identifier of the user included in the permission request data;
• transmitting, by the right-holder terminal, to the file management system, the permission data for permitting a use of the content by the user;
• and
• receiving, by the user terminal, the permission data from the file management system and using the content.