Data backup method and storage medium for use with content reproduction apparatus

• US 20030074569A1
• Filed: 04/11/2002
• Published: 04/17/2003
• Est. Priority Date: 04/12/2001
• Status: Abandoned Application

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Tanaka, Katsuaki, Yamauchi, Kenichi
• Application Number:
  US10/120,660
• Publication Number:
  US 20030074569A1
• Time in Patent Office: Days
• US Class Current: 713/189
• CPC Class Codes: G06F 21/1082 Backup or restore
• CPC Class Codes: G06F 2221/2129 Authenticate client device independently of the user
• CPC Class Codes: G11B 19/122 involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28
• 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 20/00181 using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]
• 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 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• CPC Class Codes: G11B 20/00528 wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
• 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 20/0071 involving a purchase action

Abstract

The body of content, such as audio or AV content, is provided in encrypted form free of charge. User of a content reproduction apparatus can obtain the content body free at any time, and thus a need to back up the content body can be eliminated. Content key data for decrypting the content is, on the other hand, chargeable and provided for payment, and the user only has to back up this content key data. To prevent the backed-up content key data from being unfairly used by any other apparatus, an apparatus-specific code imparted to the user'"'"'s content reproduction apparatus is backed up to a backup storage medium along with the content key data, and the backed-up content key data is allowed to be restored from the storage medium only to an apparatus having the same apparatus-specific code as the user'"'"'s content reproduction apparatus. In this way, the user'"'"'s content reproduction apparatus can perform an efficient backup of chargeable content.

Claims

1. A backup method for use with a content reproduction apparatus which reproduces content using a body of encrypted content and content key data for decrypting the encrypted content, said backup method comprising:

a step of imparting an apparatus-specific code to a predetermined content reproduction apparatus;

a step of, when content key data is to be backed up from the predetermined content reproduction apparatus to a storage medium, writing the apparatus-specific code into the storage medium along with the content key data; and

a step of, when the content key data is to be restored from the storage medium, comparing the apparatus-specific code written in the storage medium along with the content key data and an apparatus-specific code imparted to a particular reproduction apparatus, and allowing the content key data to be restored from the storage medium to the particular content reproduction apparatus on condition that the compared apparatus-specific codes match each other.

2. A backup method as claimed in claim 1 wherein the body of the encrypted content is provided free of charge while the content key data is chargeable and provided out for payment.

3. A backup storage medium for connection to a content reproduction apparatus which reproduces content using a body of encrypted content and content key data for decrypting the encrypted content, said backup storage medium comprising:

a storage area for storing an apparatus-specific code imparted to a predetermined content reproduction apparatus and content key data in corresponding relation to each other; and

control means for receiving an apparatus-specific code from a particular content reproduction apparatus to which said backup storage medium is currently connected, comparing the received apparatus-specific code and the apparatus-specific code stored in said storage area, and allowing the content key data to be output to the particular content reproduction apparatus on condition that the compared apparatus-specific codes match each other.