1
Jian Zhao, Eckhard Koch, Makoto Saito: Secure distribution of digital representations. Fraunhofer Gesellschaft, Mitsubishi Corporation, Gordon E Nelson, October 31, 2000: US06141753 (260 worldwide citation)

Techniques for secure distribution of digital representations that combine encryption and watermarking. When a user at a client desires to download a digital representation, the user makes a request to a server for the digital representation, which encrypts the digital representation using a first k ...


2
Makoto Saito: Data management system. Mitsubishi Corporation, Hecker & Harriman, October 26, 1999: US05974141 (240 worldwide citation)

The present invention provides a system to ensure security of data in a computer network system. A center certifies a public-key of user of the system and distributes a secret-key. A first system comprises the center in a network, an information provider and a plurality of users. The center identifi ...


3
Makoto Saito: Data management system. Mitsubishi Corporation, Hecker & Harriman, December 14, 1999: US06002772 (180 worldwide citation)

To prevent piracy or leakage of data content, a cryptography technique and electronic watermark technique are combined together and used. In a data content supplied to a user, a user data is entered as electronic watermark by a data management center, and the data content with an electronic watermar ...


4
Makoto Saito: Method and device for protecting digital data by double re-encryption. Berkeley Law & Technology Group, August 15, 2006: US07093295 (147 worldwide citation)

A method and an apparatus ensuring protection of digital data are provided. In addition to re-encrypting the data using an unchangeable key, the data is double re-encrypted using a changeable key. The changeable key is used first and the unchangeable key is then used, or in another case, the unchang ...


5
Makoto Saito: Data coypright management method. Mitsubishi Corporation, Hecker & Harriman, July 8, 1997: US05646999 (132 worldwide citation)

The present invention provides a process for managing data copyright in the case when a primary user produces new data by editing a plurality of original data and supplies the new data to a secondary user. A public-key and a private-key of the primary user, and a first secret-key and a second secret ...


6
Makoto Saito: Digital content management system using electronic watermark. Mitsubishi Corporation, Armstrong Westerman Hattori McLeland & Naughton, January 30, 2001: US06182218 (102 worldwide citation)

A system for managing a digital content, particularly a digital content to which a copyright is claimed, and a system for supplying a public-key which is used in the management of the digital content are provided. The digital content management program is embedded to an operating system of a user ap ...


7
Makoto Saito: Crypt key system. Mitsubishi Corporation, Hecker & Harriman, April 14, 1998: US05740246 (89 worldwide citation)

The present invention provides a concrete structure for applying a crypt key system to a television system, a database system or an electronic commercial transaction system or the like. This system consists of a broadcasting station, a database, a receiving apparatus, a data communication apparatus ...


8
Makoto Saito: Apparatus for data copyright management system. Mitsubishi Corporation, Hecker & Harriman, February 2, 1999: US05867579 (86 worldwide citation)

A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device whi ...


9
Makoto Saito, Shunichi Momiki: Data copyright management system. Mitsubishi Corporation, Armstrong Westerman Hattori McLeland & Naughton, May 30, 2000: US06069952 (77 worldwide citation)

A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections. Data supplied from the database to users is encrypted ...


10
Makoto Saito: Apparatus for data copyright management system. Mitsubishi Corporation, Armstrong Westerman & Hattori, June 18, 2002: US06408390 (73 worldwide citation)

A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device whi ...