PERMISSION INFORMATION MANAGEMENT SYSTEM, USER TERMINAL, PROPRIETOR TERMINAL, PERMISSION INFORMATION MANAGEMENT METHOD, AND PERMISSION INFORMATION MANAGEMENT PROGRAM

The blockchain used in transactions of digital virtual currency is applied to management of permissions for contents. A user terminal 1 includes a key generation unit 11 that generates a first key pair and a second key pair, a permission request unit 13 that transmits a permission request including a public encryption key of the second key pair after electronically signing the permission request with a secret encryption key of the first key pair, and a content use unit 14 that acquires, from permission information transmitted from a right-holder terminal 2, a content decryption key by using a secret decryption key of the second key pair and uses the content. The right-holder terminal 2 includes a key management unit 21 that stores therein a third key pair and the content decryption key, a permission verification unit 23 that verifies the permission request received, and a permission issuance unit 22 that encrypts the content decryption key by using the public encryption key of the second key pair included in the permission request and transmits the permission information including the encrypted content decryption key after electronically signing the permission information with a secret encryption key of the third key pair. The permission request and the permission information are transmitted and received via a blockchain.