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|1. (WO2017038507) PERMISSION INFORMATION MANAGEMENT SYSTEM, USER TERMINAL, PROPRIETOR TERMINAL, PERMISSION INFORMATION MANAGEMENT METHOD, AND PERMISSION INFORMATION MANAGEMENT PROGRAM|
|Applicants:||NIPPON TELEGRAPH AND TELEPHONE CORPORATION
|Title:||PERMISSION INFORMATION MANAGEMENT SYSTEM, USER TERMINAL, PROPRIETOR TERMINAL, PERMISSION INFORMATION MANAGEMENT METHOD, AND PERMISSION INFORMATION MANAGEMENT PROGRAM|
The present invention applies a block chain used in the transaction of digital virtual currencies to the management of permission of contents. A user terminal 1 is provided with: a key generation unit 11 for generating a first key pair and a second key pair; a permission request unit 13 for transmitting a permission request that includes an open encryption key of the second key pair after electronically signing the same using a secret encryption key of the first key pair; and a content use unit 14 for acquiring a content decryption key from permission information transmitted by a proprietor terminal 2 using a secret decryption key of the second key pair, and using the content. The proprietor terminal 2 is provided with a key management unit 21 for storing a third key pair and a content decryption key, a permission verification unit 23 for verifying the received permission request, and a permission issuance unit 22 for encrypting the content decryption key using the open decryption key of the second key pair included in the permission request and transmitting permission information that includes the encrypted content decryption key after electrically signing the same using a secret encryption key of the third key pair. The permission request and the permission information are transmitted/received via a block chain.