A permission information management system comprising a user terminal of a user of a content and a right-holder terminal of a right holder of the content, wherein the user terminal comprises: a key generation unit that generates a first key pair for an electronic signature including a secret encryption key and a public decryption key and a second key pair including a secret decryption key and a public encryption key; a permission request unit that transmits a permission request including the public encryption key of the second key pair and a public decryption key of the right holder of the content after electronically signing the permission request with the secret encryption key of the first key pair; and a content use unit that acquires, from permission information transmitted from the right-holder terminal, a content decryption key by using the secret decryption key of the second key pair, and uses the content by using the content decryption key, the right-holder terminal comprises: a key management unit that stores therein a third key pair for an electronic signature including a secret encryption key of the right-holder and the public decryption key of the right-holder, and the content decryption key for decryption of the content; a permission verification unit that verifies whether the permission request received from the user terminal satisfies a permission condition for the content; and a permission issuance unit that, when the permission request satisfies the permission condition, 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 the secret encryption key of the third key pair, and the permission request is transmitted by adding it in a block to a blockchain, and the permission information is received after being added in a block to the blockchain. a key generation unit that generates a first key pair for an electronic signature including a secret encryption key and a public decryption key and a second key pair including a secret decryption key and a public encryption key; a permission request unit that transmits a permission request including the public encryption key of the second key pair and a public decryption key of the right holder of the content after electronically signing the permission request with the secret encryption key of the first key pair; and a content use unit that acquires, from permission information transmitted from the right-holder terminal, a content decryption key by using the secret decryption key of the second key pair, and uses the content by using the content decryption key, a key management unit that stores therein a third key pair for an electronic signature including a secret encryption key of the right-holder and the public decryption key of the right-holder, and the content decryption key for decryption of the content; a permission verification unit that verifies whether the permission request received from the user terminal satisfies a permission condition for the content; and a permission issuance unit that, when the permission request satisfies the permission condition, 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 the secret encryption key of the third key pair, and