Armstrong, Westerman, Hattori, McLeland & Naughton
Crypt key system
 A crypt key system for decrypting encrypted data for use, by a permit key including a decryption key, comprising a database/charging center, a broadcasting station, a receiving device and a communication device. The permit key is supplied to the broadcasting station in advance from the database/charging center. The permit key is broadcast from the broadcasting station. The receiving device receives the permit key via the broadcast. A request for use is executed to the database/charging center via the communication device. The database/charging center transmits the encrypted data via a communication line to the communication device and charges a fee. The communication device decrypts the encrypted data with the permit key received by the receiving device. 
Mitsubishi Corporation
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inventional inventional additional inventional inventional inventional inventional
Shunichi Makoto
Momiki Saito