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Data protection system that protects data by encrypting the data
Grant 9,130,741 - Nakano , et al. September 8, 2 | 2015-09-08 |
Semiconductor memory card and data reading apparatus, and data reading/reproducing apparatus
Grant 8,661,553 - Hirota , et al. February 25, 2 | 2014-02-25 |
Data Protection System That Protects Data By Encrypting The Data
App 20130236018 - NAKANO; Toshihisa ; et al. | 2013-09-12 |
Data protection system that protects data by encrypting the data
Grant 8,416,953 - Nakano , et al. April 9, 2 | 2013-04-09 |
Encryption device, key distribution device and key distribution system
Grant 8,275,998 - Nakano , et al. September 25, 2 | 2012-09-25 |
Semiconductor Memory Card And Data Reading Apparatus, And Data Reading/reprodcuing Apparatus
App 20120117663 - Hirota; Teruto ; et al. | 2012-05-10 |
Content protection system, key data generation apparatus, and terminal apparatus
Grant 8,144,869 - Nakano , et al. March 27, 2 | 2012-03-27 |
Content reproduction apparatus
Grant 8,140,675 - Yokota , et al. March 20, 2 | 2012-03-20 |
Digital work protection system, recording apparatus, reproduction apparatus, and recording medium
Grant 8,132,024 - Nakano , et al. March 6, 2 | 2012-03-06 |
Semiconductor memory card and data reading apparatus, and data reading/reproducing apparatus
Grant 8,127,368 - Hirota , et al. February 28, 2 | 2012-02-28 |
Theft prevention system
Grant 8,048,174 - Yamamichi , et al. November 1, 2 | 2011-11-01 |
Encryption communications system
Grant 8,051,284 - Nakano , et al. November 1, 2 | 2011-11-01 |
Semiconductor memory card and data reading apparatus, and data reading/reproducing apparatus
Grant 7,996,914 - Hirota , et al. August 9, 2 | 2011-08-09 |
Encryption Device, Key Distribution Device And Key Distribution System
App 20110093706 - NAKANO; Toshihisa ; et al. | 2011-04-21 |
Parameter generation apparatus, encryption system, decryption system, encryption apparatus, decryption apparatus, encryption method, decryption method, and program thereof
Grant 7,929,688 - Yamamichi , et al. April 19, 2 | 2011-04-19 |
Content-log analyzing system and data-communication controlling device
Grant 7,886,365 - Futa , et al. February 8, 2 | 2011-02-08 |
Encryption device, key distribution device and key distribution system
Grant 7,865,716 - Nakano , et al. January 4, 2 | 2011-01-04 |
Authentication communication system, authentication communication apparatus, and authentication communication method
Grant 7,831,831 - Ohmori , et al. November 9, 2 | 2010-11-09 |
Encrypted communication system and communication device
Grant 7,813,512 - Futa , et al. October 12, 2 | 2010-10-12 |
Secure device
Grant 7,739,519 - Matsuzaki , et al. June 15, 2 | 2010-06-15 |
Digital content protection system
Grant 7,707,430 - Tatebayashi , et al. April 27, 2 | 2010-04-27 |
Content recording/reproducing system, distribution device, reproducing device, and recording device
Grant 7,702,109 - Futa , et al. April 20, 2 | 2010-04-20 |
Data Protection System That Protects Data By Encrypting The Data
App 20100034388 - NAKANO; Toshihisa ; et al. | 2010-02-11 |
Authentication system
Grant 7,657,739 - Nakano , et al. February 2, 2 | 2010-02-02 |
Information input/output system, key management device, and user device
Grant 7,647,646 - Nakano , et al. January 12, 2 | 2010-01-12 |
Copyright protection system, key generation apparatus, recording apparatus, reproduction apparatus, read-out apparatus, decryption apparatus, recording medium, recording method and program
Grant 7,620,993 - Yamamoto , et al. November 17, 2 | 2009-11-17 |
Encryption communication system
Grant 7,603,554 - Futa , et al. October 13, 2 | 2009-10-13 |
Encryption Device, A Decrypting Device, A Secret Key Generation Device, A Copyright Protection System And A Cipher Communication Device
App 20090208007 - Ohmori; Motoji ; et al. | 2009-08-20 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
Grant 7,577,251 - Kawada , et al. August 18, 2 | 2009-08-18 |
Copyright protection system, recording device, and reproduction device
Grant 7,555,779 - Nakano , et al. June 30, 2 | 2009-06-30 |
Encryption device a decrypting device a secret key generation device a copyright protection system and a cipher communication device
Grant 7,542,568 - Ohmori , et al. June 2, 2 | 2009-06-02 |
Data converter for performing exponentiation in polynomial residue class ring with value in finite field as coefficient
Grant RE40,710 - Yokota , et al. May 12, 2 | 2009-05-12 |
Contents management method, contents management apparatus, and recording medium
Grant 7,505,584 - Kamibayashi , et al. March 17, 2 | 2009-03-17 |
Deactivation system
Grant 7,503,066 - Tatebayashi , et al. March 10, 2 | 2009-03-10 |
Encryption apparatus, decryption apparatus, secret key generation apparatus, and copyright protection system
Grant 7,484,090 - Ohmori , et al. January 27, 2 | 2009-01-27 |
Key agreement system, shared-key generation apparatus, and shared-key recovery apparatus
Grant 7,471,792 - Yamamichi, legal representative , et al. Decembe | 2008-12-30 |
Digital Content Protection System
App 20080263367 - TATEBAYASHI; Makoto ; et al. | 2008-10-23 |
Encryption Communications System
App 20080253567 - NAKANO; Toshihisa ; et al. | 2008-10-16 |
Rental system
Grant 7,426,494 - Ohmori , et al. September 16, 2 | 2008-09-16 |
Content Protection System, Key Data Generation Apparatus, And Terminal Apparatus
App 20080205652 - NAKANO; Toshihisa ; et al. | 2008-08-28 |
Encrypted data delivery system
Grant 7,404,076 - Nakano , et al. July 22, 2 | 2008-07-22 |
Information recording medium for recording a scrambled part of content information, and method and apparatus for reproducing information recorded therein
Grant 7,400,725 - Yumiba , et al. July 15, 2 | 2008-07-15 |
Encryption apparatus, decryption apparatus and encryption system
Grant 7,394,902 - Yamamichi , et al. July 1, 2 | 2008-07-01 |
Data protection system that protects data by encrypting the data
Grant 7,395,425 - Nakano , et al. July 1, 2 | 2008-07-01 |
Revocation information updating method, revocation information updating apparatus and storage medium
Grant 7,392,225 - Harada , et al. June 24, 2 | 2008-06-24 |
Content protection system, key data generation apparatus, and terminal apparatus
Grant 7,386,126 - Nakano , et al. June 10, 2 | 2008-06-10 |
Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry
Grant 7,386,618 - Futa , et al. June 10, 2 | 2008-06-10 |
Theft prevention system
App 20080122595 - Yamamichi; Masato ; et al. | 2008-05-29 |
Semiconductor memory card and data reading apparatus, and data reading/reproducing apparatus
App 20080115210 - Hirota; Teruto ; et al. | 2008-05-15 |
Public key certificate revocation list generation apparatus, revocation judgement apparatus, and authentication system
Grant 7,373,503 - Nakano , et al. May 13, 2 | 2008-05-13 |
Encryption transmission system
Grant 7,359,511 - Matsuzaki , et al. April 15, 2 | 2008-04-15 |
Copyright protection system, recording device, and reproduction device
App 20080044017 - Nakano; Toshihisa ; et al. | 2008-02-21 |
Digital content protection system
Grant 7,298,845 - Tatebayashi , et al. November 20, 2 | 2007-11-20 |
Authentication system and key registration apparatus
Grant 7,296,147 - Matsuzaki , et al. November 13, 2 | 2007-11-13 |
Secure device
App 20070234074 - Matsuzaki; Natsume ; et al. | 2007-10-04 |
Digital work protection system, key management apparatus, and user apparatus
Grant 7,272,229 - Nakano , et al. September 18, 2 | 2007-09-18 |
Service providing system in which services are provided from service provider apparatus to service user apparatus via network
Grant 7,254,705 - Yokota , et al. August 7, 2 | 2007-08-07 |
Encryption device, key distribution device and key distribution system
App 20070174606 - Nakano; Toshihisa ; et al. | 2007-07-26 |
Authentication system, authentication apparatus, and recording medium
App 20070168674 - Nonaka; Masao ; et al. | 2007-07-19 |
Secure device
Grant 7,246,247 - Matsuzaki , et al. July 17, 2 | 2007-07-17 |
Encrypted communication system and communication device
App 20070150735 - Futa; Yuichi ; et al. | 2007-06-28 |
Numerical array output device, a numerical array output method, an encryption device, and a decryption device
Grant 7,233,662 - Futa , et al. June 19, 2 | 2007-06-19 |
Content reproduction apparatus
App 20070092081 - Yokota; Kaoru ; et al. | 2007-04-26 |
Reception terminal, key management apparatus, and key updating method for public key cryptosystem
Grant 7,206,412 - Yokota , et al. April 17, 2 | 2007-04-17 |
Authentication system
App 20070083757 - Nakano; Toshihisa ; et al. | 2007-04-12 |
Contents management method, content management apparatus, and recording medium
Grant 7,181,008 - Kamibayashi , et al. February 20, 2 | 2007-02-20 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
App 20060291653 - Kawada; Hirotsugu ; et al. | 2006-12-28 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
App 20060291652 - Kawada; Hirotsugu ; et al. | 2006-12-28 |
Method for authentication between apparatuses using challenge and response system
Grant 7,155,607 - Yokota , et al. December 26, 2 | 2006-12-26 |
Cryptocommunication system, transmission apparatus, and reception apparatus
Grant 7,155,610 - Yamamichi , et al. December 26, 2 | 2006-12-26 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
App 20060285688 - Kawada; Hirotsugu ; et al. | 2006-12-21 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
App 20060285687 - Kawada; Hirotsugu ; et al. | 2006-12-21 |
Storage medium and contents protection method using the storage medium
Grant 7,137,012 - Kamibayashi , et al. November 14, 2 | 2006-11-14 |
Parameter generation apparatus, encryption system, decryption system, encryption apparatus, decryption apparatus, encryption method, decryption method, and program thereof
App 20060239459 - Yamamichi; Masato ; et al. | 2006-10-26 |
Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus
Grant 7,120,251 - Kawada , et al. October 10, 2 | 2006-10-10 |
Contents management method, contents management apparatus, and recording medium
App 20060188093 - Kamibayashi; Toru ; et al. | 2006-08-24 |
Encryption communication system
App 20060171530 - Futa; Yuichi ; et al. | 2006-08-03 |
Information input/output system
App 20060168357 - Nakano; Toshihisa ; et al. | 2006-07-27 |
Mutual authentication method, recording apparatus, reproducing apparatus, and recording medium
Grant 7,065,648 - Kamibayashi , et al. June 20, 2 | 2006-06-20 |
Semiconductor memory card and data reading apparatus, and data reading/reproducing apparatus
App 20060129819 - Hirota; Teruto ; et al. | 2006-06-15 |
Semiconductor memory card, data reading apparatus and data reading/reproducing apparatus
Grant 7,062,652 - Hirota , et al. June 13, 2 | 2006-06-13 |
Positional information storage system and method, semiconductor memory, and program
Grant 7,023,362 - Futa , et al. April 4, 2 | 2006-04-04 |
Data converter and method thereof
Grant 6,995,692 - Yokota , et al. February 7, 2 | 2006-02-07 |
Cryptographic apparatus for performing cryptography on a specified area of content data
Grant 6,971,022 - Katta , et al. November 29, 2 | 2005-11-29 |
Revocation information updating method, revocation information updating apparatus and storage medium
App 20050154880 - Harada, Shunji ; et al. | 2005-07-14 |
Method of encryption and decryption with block number dependant key sets, each set having a different number of keys
Grant 6,917,684 - Tatebayashi , et al. July 12, 2 | 2005-07-12 |
Digital content protection system
App 20050102527 - Tatebayashi, Makoto ; et al. | 2005-05-12 |
Extended key generator, encryption/decryption unit, extended key generation method, and storage medium
Grant 6,891,950 - Oomori , et al. May 10, 2 | 2005-05-10 |
Data converter and method thereof
App 20050089161 - Yokota, Kaoru ; et al. | 2005-04-28 |
Encryption apparatus, decryption apparatus, secret key generation apparatus, and copyright protection system
App 20050078825 - Ohmori, Motoji ; et al. | 2005-04-14 |
Production protection system dealing with contents that are digital production
Grant 6,862,582 - Harada , et al. March 1, 2 | 2005-03-01 |
Digital content protection system
Grant 6,859,535 - Tatebayashi , et al. February 22, 2 | 2005-02-22 |
Revocation information updating method, revocation informaton updating apparatus and storage medium
Grant 6,850,914 - Harada , et al. February 1, 2 | 2005-02-01 |
Index-information generating apparatus content presenting apparatus and content presenting system
App 20050015798 - Yamamichi, Masato ; et al. | 2005-01-20 |
Semiconductor memory card and data reading apparatus
App 20050005149 - Hirota, Teruto ; et al. | 2005-01-06 |
Digital work protection system, recording apparatus, reproduction apparatus, and recording medium
App 20040243814 - Nakano, Toshihisa ; et al. | 2004-12-02 |
Key agreement system, shared-key generation apparatus, and shared-key recovery apparatus
App 20040174997 - Yamamichi, Masato ; et al. | 2004-09-09 |
Semiconductor memory card, data reading apparatus, and data reading/reproducing apparatus
Grant 6,789,192 - Hirota , et al. September 7, 2 | 2004-09-07 |
Key agreement system, shared-key generation apparatus, and shared-key recovery apparatus
App 20040165726 - Yamamichi, Masato ; et al. | 2004-08-26 |
Content protection system, key data generation apparatus, and terminal apparatus
App 20040156509 - Nakano, Toshihisa ; et al. | 2004-08-12 |
Production protection system dealing with contents that are digital production
App 20040139026 - Harada, Shunji ; et al. | 2004-07-15 |
Encrypted data delivery system
App 20040098579 - Nakano, Toshihisa ; et al. | 2004-05-20 |
Region restrictive playback system
App 20040076404 - Nakano, Toshihisa ; et al. | 2004-04-22 |
Encryption apparatus, decryption apparatus and encryption system
App 20040071293 - Yamamichi, Masato ; et al. | 2004-04-15 |
Production protection system dealing with contents that are digital production
Grant 6,687,683 - Harada , et al. February 3, 2 | 2004-02-03 |
Deactivation system
App 20040019800 - Tatebayashi, Makoto ; et al. | 2004-01-29 |
Authentication system and key registration apparatus
App 20040010688 - Matsuzaki, Natsume ; et al. | 2004-01-15 |
Content distributing system and data-communication controlling device
App 20040010687 - Futa, Yuichi ; et al. | 2004-01-15 |
Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry
App 20040003291 - Futa, Yuichi ; et al. | 2004-01-01 |
Authentication communication system, authentication communication apparatus, and authentication communication method
App 20040003239 - Ohmori, Motoji ; et al. | 2004-01-01 |
Content-log analyzing system and data-communication controlling device
App 20030228015 - Futa, Yuichi ; et al. | 2003-12-11 |
Positional information storage system and method , semiconductor memory, and program
App 20030222797 - Futa, Yuichi ; et al. | 2003-12-04 |
Semiconductor memory card, data reading apparatus, and data reading/reproducing apparatus
App 20030221103 - Hirota, Teruto ; et al. | 2003-11-27 |
Information input/output system, key management device, and user device
App 20030221097 - Nakano, Toshihisa ; et al. | 2003-11-27 |
Device authentication and encrypted communication system offering increased security
Grant 6,654,883 - Tatebayashi November 25, 2 | 2003-11-25 |
Public key certificate revocation list generation apparatus, revocation judgement apparatus, and authentication system
App 20030217265 - Nakano, Toshihisa ; et al. | 2003-11-20 |
Data protection system that protects data by encrypting the data
App 20030182565 - Nakano, Toshihisa ; et al. | 2003-09-25 |
Secure device
App 20030182569 - Matsuzaki, Natsume ; et al. | 2003-09-25 |
Service providing system in which services are provided from service provider apparatus to service user apparatus via network
App 20030177363 - Yokota, Kaoru ; et al. | 2003-09-18 |
Method for authentication between apparatuses using challenge and response system
App 20030159041 - Yokota, Kaoru ; et al. | 2003-08-21 |
Copyright protection system, recording device, and reproduction device
App 20030152222 - Nakano, Toshihisa ; et al. | 2003-08-14 |
Semiconductor memory card
Grant 6,606,707 - Hirota , et al. August 12, 2 | 2003-08-12 |
Encryption transmission system
App 20030145336 - Matsuzaki, Natsume ; et al. | 2003-07-31 |
Revocation information updating method, revocation information updating apparatus and storage medium
Grant 6,581,160 - Harada , et al. June 17, 2 | 2003-06-17 |
Digital work protection system, key management apparatus, and user apparatus
App 20030081792 - Nakano, Toshihisa ; et al. | 2003-05-01 |
Numerical array output device, a numerical array output method, an encryption device, and a decryption device
App 20030081770 - Futa, Yuichi ; et al. | 2003-05-01 |
Key management apparatus
App 20030081786 - Nakano, Toshihisa ; et al. | 2003-05-01 |
Encryption system for distributing a common crypt key
Grant 6,550,009 - Uranaka , et al. April 15, 2 | 2003-04-15 |
Rental system
App 20020198844 - Ohmori, Motoji ; et al. | 2002-12-26 |
Reception terminal, key management apparatus, and key updating method for public key cryptosystem
App 20020164035 - Yokota, Kaoru ; et al. | 2002-11-07 |
Block cipher using key data merged with an intermediate block generated from a previous block
Grant 6,459,792 - Ohmori , et al. October 1, 2 | 2002-10-01 |
Cryptocommunication system, transmission apparatus, and reception apparatus
App 20020116612 - Yamamichi, Masato ; et al. | 2002-08-22 |
Key management device/method/program, recording medium, reproducing device/method, recording device, and computer-readable, second recording medium storing the key management program for copyright protection
App 20020076204 - Nakano, Toshihisa ; et al. | 2002-06-20 |
Encryption system capable of specifying a type of an encrytion device that produced a distribution medium
Grant 6,359,986 - Tatebayashi March 19, 2 | 2002-03-19 |
Cryptographic Processing Apparatus, Cryptographic Processing Method, And Storage Medium Storing Cryptographic Processing Program For Improving Security Without Greatly Increasing Hardware Scale And Processing Time
App 20020015492 - OHMORI, MOTOJI ; et al. | 2002-02-07 |
Apparatus and method for preventing unauthorized use of information recorded on an information recording medium
Grant 6,289,102 - Ueda , et al. September 11, 2 | 2001-09-11 |
Information devices which select and use one out of plurality of encryption utilization protocols for protecting copyrights of digital productions
Grant 6,182,215 - Tatebayashi , et al. January 30, 2 | 2001-01-30 |
Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded
Grant 6,160,890 - Tatebayashi , et al. December 12, 2 | 2000-12-12 |
Encrypted communication system that limits the damage caused when a secret key has been leaked
Grant 6,151,394 - Tatebayashi , et al. November 21, 2 | 2000-11-21 |
Encryption apparatus for ensuring security in communication between devices
Grant 6,058,476 - Matsuzaki , et al. May 2, 2 | 2000-05-02 |
One-way data conversion apparatus and device authentication system
Grant 6,049,611 - Tatebayashi , et al. April 11, 2 | 2000-04-11 |
Data transmitter, data transmitting method, data receiver, information processor, and information recording medium
Grant 6,047,103 - Yamauchi , et al. April 4, 2 | 2000-04-04 |
Device authentication system which allows the authentication function to be changed
Grant 6,034,618 - Tatebayashi , et al. March 7, 2 | 2000-03-07 |
Communication device which performs two-way encryption authentication in challenge response format
Grant 6,028,937 - Tatebayashi , et al. February 22, 2 | 2000-02-22 |
Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded
Grant 6,009,174 - Tatebayashi , et al. December 28, 1 | 1999-12-28 |
Bit agitator
Grant 5,825,885 - Miyaji , et al. October 20, 1 | 1998-10-20 |
Personal authentication method
Grant 5,790,667 - Omori , et al. August 4, 1 | 1998-08-04 |
Method for generating and verifying electronic signatures and privacy communication using elliptic curves
Grant 5,442,707 - Miyaji , et al. August 15, 1 | 1995-08-15 |
Apparatus and method for data encryption with block selection keys and data encryption keys
Grant 5,351,299 - Matsuzaki , et al. September 27, 1 | 1994-09-27 |
Method of privacy communication using elliptic curves
Grant 5,351,297 - Miyaji , et al. September 27, 1 | 1994-09-27 |
Public key cryptosystem with an elliptic curve
Grant 5,272,755 - Miyaji , et al. December 21, 1 | 1993-12-21 |
Method for generating a public key
Grant 5,199,070 - Matsuzaki , et al. March 30, 1 | 1993-03-30 |
Cryptographic key distribution method and system
Grant 5,124,117 - Tatebayashi , et al. June 23, 1 | 1992-06-23 |
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