Inventor
AKIYAMA RYOTA
JP44 patents
⚠️ This page may combine multiple inventors who share the name “AKIYAMA RYOTA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
40 patentsUS5805699ASep 8, 1998
Software copying system
FUJITSU LTD202 citations99
US5796824AAug 18, 1998
Storage medium for preventing an irregular use by a third party
FUJITSU LTD163 citations99
US5737413AApr 7, 1998
Information distribution system wherein storage medium storing ciphered information is distributed
FUJITSU LTD180 citations99
US5555304ASep 10, 1996
Storage medium for preventing an illegal use by a third party
FUJITSU LTD109 citations99
US5539825AJul 23, 1996
Electronic cashless transaction system
FUJITSU LTD327 citations99
US5428684AJun 27, 1995
Electronic cashless transaction system
FUJITSU LTD275 citations99
US5392351AFeb 21, 1995
Electronic data protection system
FUJITSU LTD373 citations99
US6700989B1Mar 2, 2004
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 LTD192 citations98
US5623548AApr 22, 1997
Transformation pattern generating device and encryption function device
FUJITSU LTD119 citations98
US5784464AJul 21, 1998
System for and method of authenticating a client
FUJITSU LTD305 citations97
US5812661ASep 22, 1998
Software reproduction apparatus
FUJITSU LTD59 citations96
US5584022ADec 10, 1996
Enciphered file sharing method
FUJITSU LTD66 citations96
US5499299AMar 12, 1996
Modular arithmetic operation system
FUJITSU LTD101 citations96
US5440631AAug 8, 1995
Information distribution system wherein storage medium storing ciphered information is distributed
FUJITSU LTD55 citations96
US5386468AJan 31, 1995
Method of registering identification number in personal communication terminal
FUJITSU LTD138 citations96
US5325433AJun 28, 1994
Encryption communication system
FUJITSU LTD64 citations96
US6460137B1Oct 1, 2002
Encryption processing system
FUJITSU LTD69 citations95
US5832210ANov 3, 1998
Device and method for controlling communication
FUJITSU LTD72 citations95
US5787179AJul 28, 1998
Scrambling and descrambling of data with improved security
FUJITSU LTD68 citations94
US6636970B2Oct 21, 2003
Software encoding using a combination of two types of encoding and encoding type identification information
FUJITSU LTD27 citations93
US6067640AMay 23, 2000
System for management of software employing memory for processing unit with regulatory information, for limiting amount of use and number of backup copies of software
FUJITSU LTD19 citations93
US5822771AOct 13, 1998
System for management of software employing memory for processing unit with regulatory information, for limiting amount of use and number of backup copies of software
FUJITSU LTD33 citations93
US5812663ASep 22, 1998
Data reproducing device
FUJITSU LTD27 citations93
US5768387AJun 16, 1998
Key authentication method and key authentication apparatus
FUJITSU LTD35 citations93
US5737415AApr 7, 1998
Data management module, data reproduction management device and data reproduction management system
FUJITSU LTD34 citations93
US5680453AOct 21, 1997
Software delivery system, center device, relaying device and user terminal device
FUJITSU LTD38 citations93
US7013392B1Mar 14, 2006
File processing unit
FUJITSU LTD24 citations92
US7000114B1Feb 14, 2006
Apparatus to create and/or verify digital signatures having a secure time element and an identifier of the apparatus
FUJITSU LTD40 citations92
US4959863ASep 25, 1990
Secret speech equipment
FUJITSU LTD27 citations92
US6144745ANov 7, 2000
Method of and apparatus for retaining and verifying of data on recording medium
FUJITSU LTD33 citations90
US7512801B1Mar 31, 2009
Authentication system, authentication method, signing apparatus, signing method, certifying apparatus, certifying method, and a computer-readable recording medium with a program making a computer execute the method recording therein
FUJITSU LTD11 citations84
US6944734B2Sep 13, 2005
Storage apparatus and access control method
FUJITSU LTD18 citations83
US7154824B2Dec 26, 2006
Storage apparatus
FUJITSU LTD7 citations74
US5774651AJun 30, 1998
False statement detection system
FUJITSU LTD12 citations74
US7421078B2Sep 2, 2008
Valid medium management system
FUJITSU LTD4 citations63
USRE39802EAug 28, 2007
Storage medium for preventing an irregular use by a third party
FUJITSU LTD2 citations63
US7010127B2Mar 7, 2006
Cryptographic communication method, file access system and recording medium
FUJITSU LTD2 citations62
US5065430ANov 12, 1991
Voice band splitting scrambler
FUJITSU LTD6 citations62
USRE40547EOct 21, 2008
Software reproduction apparatus
FUJITSU LTD0 citations52
US7555651B2Jun 30, 2009
Time management apparatus and time management method
FUJITSU LTD0 citations51