Data transmitting system and method, drive unit, access method, data recording medium, recording medium producing apparatus and method

• US 9,390,254 B2
• Filed: 04/23/2013
• Issued: 07/12/2016
• Est. Priority Date: 08/20/1999
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Tomoyuki, Osawa, Yoshitomo
• Primary Examiner(s): CHEN, SHIN HON
• Application Number:
  US13/868,734
• Publication Number:
  US 20130239174A1
• Time in Patent Office: 1,176 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 21/445 by mutual authentication, e.g. between devices or programs
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00876 wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry

Abstract

A security module is provided in a data recording medium, data to be written to the data recording medium is encrypted with an content key different from one data to another, and the content key is safely stored in the security module. Also, the security module makes a mutual authentication using the public-key encryption technology with a drive unit to check that the counterpart is an authorized (licensed) unit, and then gives the content key to the counterpart, thereby preventing data from being leaked to any illegal (unlicensed) unit. Thus, it is possible to prevent copyrighted data such as movie, music, etc. from being copied illegally (against the wish of the copyrighter of the data).

Claims

1. A first apparatus for storing information, the first apparatus being portable and comprising:

a memory circuit comprising nonvolatile memory, the nonvolatile memory including;

a first storage circuit that stores first revocation list information, and

a second storage circuit that stores content;

a case external to the memory unit; and

a secure circuit configured to;

examine whether or not a second apparatus is revoked based on the first revocation list information held in the first apparatus, the second apparatus being distinct from the first apparatus,

carry out a mutual authentication protocol with the second apparatus,

after the mutual authentication protocol has been carried out, compare a version of the first revocation list information with a version of a second revocation list information that is received from the second apparatus to identify which of the first revocation list information and the second revocation list information is a newer version, and

after the mutual authentication protocol has been carried out, selectively replace the first revocation list information with the second revocation list information when the second revocation list information is the newer version and transmit the first revocation list information to the second apparatus when the first revocation list information is the newer version, based on the examination and at least one of a result of the comparison and a result of the mutual authentication protocol, wherein the first revocation list information is not replaced when the second apparatus has been revoked.

2. The apparatus of claim 1, wherein the first revocation list information is only replaced when the mutual authentication protocol authenticates the information processing apparatus.

3. The apparatus of claim 1, wherein:

the comparison result includes an indication of whether the first revocation list information or the second revocation list information is newer; and

the first revocation list information is only replaced when the second revocation list information is newer than the first revocation list information.

4. The apparatus of claim 1, wherein the examining indicates that a private key has been revealed.

5. The apparatus of claim 1, wherein the secure circuit is configured to receive identifying information from the second apparatus.

6. The storage apparatus of claim 1, wherein the first storage circuit is more secure than the second storage circuit.

7. A first apparatus for storing information, the first apparatus being portable and comprising:

a case; and

circuitry, disposed in the case, configured to

store first revocation list information and content;

examine whether or not a second apparatus is revoked based on the first revocation list information held in the first apparatus, the second apparatus being distinct from the first apparatus,

carry out a mutual authentication protocol with the second apparatus,

after the mutual authentication protocol has been carried out, compare a version of the first revocation list information with a version of a second revocation list information that is received from the second apparatus to identify which of the first revocation list information and the second revocation list information is a newer version, and

after the mutual authentication protocol has been carried out, selectively replace the first revocation list information with the second revocation list information when the second revocation list information is the newer version and transmit the first revocation list information to the second apparatus when the first revocation list information is the newer version, based on the examination and at least one of a result of the comparison and a result of the mutual authentication protocol, wherein the first revocation list information is not replaced when the second apparatus has been revoked.