U.S. Patent 11165567 was awarded to NIPPON TELEGRAPH AND TELEPHONE CORPORATION on November 02, 2021 and is entitled “Permission information management system, and permission information management method.” The first named inventor is Akihito Akutsu of Yokosuka, . The abstract contains an overview of the patent disclosure:

A user terminal generates a first key pair and a second key pair, 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, and acquires, from permission information transmitted from a right-holder terminal, a content decryption key by using a secret decryption key of the second key pair and uses the content. The right-holder terminal stores a third key pair and the content decryption key, verifies the permission request received, and 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. Link to Full Patent

This blockchain patent was originally filed on August 19, 2016  as U.S. Patent Application 15/754665 at the United Stated Patent and Trademark Office. The application was them awarded a patent grant and published as U.S. Patent 11165567. The primary examiner was Jeffrey Nickerson.

NIPPON TELEGRAPH AND TELEPHONE CORPORATION, who is the original assignee of this patent, has at least 3422 total granted patents in the United States as of the date of this article. This blockchain patent has been cited 0 times by other U.S. patents according to our law firm research, and can be considered an innovative patent in the field of cryptocurrency and blockchain.

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