1
Ryota Akiyama, Takayuki Hasebe: Electronic cashless transaction system. Fujitsu, Nikaido Marmelstein Murray & Oram, July 23, 1996: US05539825 (235 worldwide citation)

A key control method is for use in an electronic cashless transaction system including at least a bank center, a store transaction terminal and an IC card being used as an electronic cashless transaction medium. The key control method comprises a step of having the bank center generate and code a fi ...


2
Takayuki Hasebe, Ryota Akiyama, Makoto Yoshioka: Electronic data protection system. Fujitsu, Nikaido Marmelstein Murray & Oram, February 21, 1995: US05392351 (205 worldwide citation)

An electronic data protection system for protecting electronic data from illegal copying by a third party, includes: a storage medium for storing an encrypted electronic data, a medium number and encrypted permission information; a vendor computer having a personal key generating unit for generating ...


3
Ryota Akiyama, Takayuki Hasebe: Electronic cashless transaction system. Fujitsu, Nikaido Marmelstein Murray & Oram, June 27, 1995: US05428684 (151 worldwide citation)

A key control method is for use in an electronic cashless transaction system including at least a bank center, a store transaction terminal and an IC card being used as an electronic cashless transaction medium. The key control method comprises a step of having the bank center generate and code a fi ...


4
Ryota Akiyama, Akio Munakata, Yuzuru Koga, Masayuki Ishizaki: System for and method of authenticating a client. Fujitsu, Staas and Halsey, July 21, 1998: US05784464 (145 worldwide citation)

A key management unit of a service provider system generates an individual key corresponding to a portable module connected to a service client making an access request and informs an authenticating unit of this individual key. The individual key is stored beforehand also in the portable module. A r ...


5
Ryota Akiyama, Makoto Yoshioka, Yoshiaki Uchida: Software copying system. Fujitsu, Staas & Halsey, September 8, 1998: US05805699 (113 worldwide citation)

A software copying system which enables copyrighted software recorded in a master storage medium to be copied to a user's target storage medium in a legitimate manner. A contents identifier reading unit reads out a software identifier from the master storage medium, while a storage medium identifier ...


6
Ryota Akiyama, Takayuki Hasebe, Makoto Yoshioka: Information distribution system wherein storage medium storing ciphered information is distributed. Fujitsu, Staas & Halsey, April 7, 1998: US05737413 (95 worldwide citation)

A system for use when distributing information stored in a piece of storage medium from a supplier to users through a distributor(s). The information is ciphered when stored in each piece of storage medium in a supplier apparatus. In addition, ciphered key information may be stored in the piece of s ...


7
Takayuki Hasebe, Ryota Akiyama, Makoto Yoshioka: Storage medium for preventing an irregular use by a third party. Fujitsu, Nikaido Marmelstein Murray & Oram, August 18, 1998: US05796824 (90 worldwide citation)

A storage medium stores encrypted electronic data, a medium personal number which is unique for each storage medium and encrypted permission information. At least the medium personal number is written onto the storage medium in an un-rewritable form which a user computer cannot rewrite.


8
Hiroyasu Itoh, Ryota Akiyama, Toru Nakagawa: Device for generating, detecting, recording, and reproducing a watermarked moving image having a copy preventing capability and storage medium for storing program or the moving image. Fujitsu, Staas & Halsey, March 2, 2004: US06700989 (88 worldwide citation)

The present invention relates to a contrivance for inserting watermark information into a moving image. The watermark information indicative of the ownership of the copyright of the moving image is inserted into the frames of the moving image at irregular intervals, the frames being of such a number ...


9
Ryota Akiyama, Toshihiro Yabe, Kazutoshi Motohashi: Method of registering identification number in personal communication terminal. Fujitsu, January 31, 1995: US05386468 (77 worldwide citation)

Prior to the sale of a personal communication terminal, a secret key is generated and stored in the personal communication terminal in accordance with an application made from the manufacturer to the carrier. At this time, the communication between the manufacturer and the carrier is performed in th ...


10
Takayuki Hasebe, Ryota Akiyama, Makoto Yoshioka: Storage medium for preventing an illegal use by a third party. Fujitsu, Nikaido Marmelstein Murray & Oram, September 10, 1996: US05555304 (60 worldwide citation)

A storage medium stores encrypted electronic data, a medium personal number which is unique for each storage medium and encrypted permission information. At least the medium personal number is written onto the storage medium in an un-rewritable form which a user computer cannot rewrite.