Information recording medium, recording apparatus, information transmission system, and decryption apparatus

• US 6,144,743 A
• Filed: 02/06/1998
• Issued: 11/07/2000
• Est. Priority Date: 02/07/1997
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ando, Hideo, Yamada, Hisashi
• Primary Examiner(s): Trammell, James P.
• Assistant Examiner(s): Nguyen, Cuong H.
• Application Number:
  US09/019,586
• Time in Patent Office: 1,005 Days
• Field of Search: 380/16, 380/24, 380/25, 380/30, 380/28, 380/49, 380/44, 380/45, 380/51, 380/10, 380/20, 380/52, 705/1, 705/26, 705/30, 705/34, 705/35, 705/39, 705/40, 705/42, 705/44, 705/405, 705/18
• US Class Current: 380/44
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40 Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
• CPC Class Codes: G06Q 20/40975 using encryption therefor
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00137 involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users
• CPC Class Codes: G11B 20/00144 involving a user identifier, e.g. a unique customer ID
• CPC Class Codes: G11B 20/00152 involving a password
• CPC Class Codes: G11B 20/00188 involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
• CPC Class Codes: G11B 20/00195 using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00224 wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/00231 wherein the key is obtained from a local external medium, e.g. a card
• CPC Class Codes: G11B 20/00413 wherein the key is input by a user
• CPC Class Codes: G11B 20/00557 wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00688 said measures preventing that a usable copy of recorded data can be made on another medium
• CPC Class Codes: G11B 20/00739 wherein the usage restriction is associated with a specific geographical region
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 2220/60 : Solid state media details of solid state memory devices G11C

Abstract

In the invention, an information recording medium records encrypted information, encrypted key information obtained by encrypting key information for decrypting the encrypted information to obtain original information, and non-encrypted condition information used upon decrypting the encrypted information and recorded in the encrypted key information, and the encrypted information from the information recording medium is decrypted inside an IC card using the encrypted key information and condition information. Upon decrypting the encrypted information from the information recording medium, information that requires security protection or copyright protection can be prevented from being illicitly copied.

Claims

1. A key information generating method executed by an encoder and a decoder, wherein the encoder includes first key information generating means for generating transmission-side key information that is used for encrypting the contents information and first memorizing means for memorizing the transmission-side key information, and the decoder includes second key information generating means for generating reception-side key information that is used for decrypting the encrypted contents information and second memorizing means for memorizing the reception-side key information, said method being used for generating the transmission-side key information by controlling the first key information generating means and the first memorizing means and for generating the reception-side key information by controlling the second key information generating means and the second memorizing means, said method comprising:

(A) controlling the first key information generating means and the first memorizing means, said controlling including;

(Aa) generating first information on the basis of copy permission information which indicates whether or not contents information is permitted to be copied; and

(Ab) generating second information as the transmission-side key information, on the basis of the first information, and

(B) controlling the second key information generating means and the second memorizing means, said controlling including;

(Ba) generating third information on the basis of the copy permission information; and

(Bb) generating fourth information as the reception side key information on the basis of the third information.