Title:
【発明の名称】ディジタル情報通信システム及びその方法
Document Type and Number:
Japanese Patent JP3331552
Kind Code:
B2
Abstract:
PURPOSE:To provide a method and a system for digital information communication which protect the copy right by enabling a specific regular user group consisting of plural members to freely make a copy for backup or use information in terminals other than the reception terminal with respect to chargeable digital information received and purchased by communication use and preventing the illegal use of groups other than the regular user group for the purpose of protecting the right of a copyright holder and an information presenter. CONSTITUTION:A card 2 which has a security information storage part 21 where the user identification number different by cards, is provided only one group secret key set to a group in common, etc., are stored, and the card 2 and a terminal equipment 3 are connected, and the user identification number stored in the card 2 is transmitted from the terminal equipment 3 to an information center device 1 to request the information, and the received information main body is enciphered with the group secret key and is stored in the terminal equipment 3, and the information main body is deciphered by the group secret key when being used.
Inventors:
Masato Kanda
Yoshiyoshi Yamanaka
Yoshiyoshi Yamanaka
Application Number:
JP8683794A
Publication Date:
October 07, 2002
Filing Date:
April 25, 1994
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G06F15/00; G06F21/00; G06F21/10; G06F21/34; G06F21/35; G06F21/62; G09C1/00; H04L9/00; H04L9/08; H04L9/10; H04L9/12; H04L9/32; H04N7/167; H04N21/239; H04N21/418; (IPC1-7): H04L9/08; G06F15/00; H04N7/167
Domestic Patent References:
| JP3214834A | ||||
| JP6350288A | ||||
| JP4118777A |
Attorney, Agent or Firm:
Seiko Yoshida