Record carrier for storing a digital work

• US 20030007437A1
• Filed: 05/20/2002
• Published: 01/09/2003
• Est. Priority Date: 05/22/2001
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Staring, Antonius Adriaan Maria
• Granted Patent: US 8,364,981 B2
• Time in Patent Office: Days
• US Class Current: 369/53.21
• 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 20/00369 wherein a first key, which is usually stored on a hidden channel, e.g. in the lead-in of a BD-R, unlocks a key locker containing a second
• CPC Class Codes: G11B 20/00789 wherein the usage restriction limits the number of functional copies, which can be accessed at a time, e.g. electronic bookshelf concept, virtual library, video rentals or check-in/check out
• CPC Class Codes: G11B 20/00797 wherein the usage restriction limits the number of times a content can be reproduced, e.g. using playback counters
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date

Abstract

The present invention relates to a record carrier for storing a digital work (DW). The record carrier (10) comprises access information (KLT) for gaining access to the digital work and a secondary channel (HC) in which secondary channel information (KLK) is stored which is used for encrypting, decrypting or verifying the access information (KLT). In order to prevent, hinder or discourage tampering with the access information (KLT), the secondary channel (HC) is stored on the record carrier on substantially the same physical location as the access information (KLT). In a preferred embodiment, the secondary channel information (KLK) is changed when the access information (KLT) has changed. This realizes a record carrier for which a replay-attack is prevented. The invention further relates to a method for recording a digital work on a record carrier, a device for recording and a device for reading.

Claims

1. A record carrier for storing a digital work (DW), wherein the record carrier (10) comprises access information (KLT) for gaining access to the digital work, and a secondary channel (HC) in which secondary channel information (KLK) is stored which is used for encrypting, decrypting or verifying the access information, wherein the secondary channel (HC) is stored on the record carrier on substantially the same physical location as the access information (KLT).

2. A record carrier according to claim 1, wherein the secondary channel is stored on the record carrier by controlling the polarity of a predetermined runlength of a predetermined data or control symbol of a runlength-limited code sequence.

3. A record carrier according to claim 1 or 2, wherein the secondary channel information (HC) is changed when the access information (KLT) has changed.

4. A record carrier according to claim 1, 2 or 3, wherein the access information (KLT) is usage right information defining one or more conditions which must be satisfied in order for the usage right to be exercised.

5. A record carrier according to claim 1, 2, 3 or 4, wherein the secondary channel (HC) is a hidden channel which is not accessible by non-compliant reproducing devices.

6. A record carrier according to claim 1, wherein said record carrier is a recordable optical disc (10), in particular a CD or a DVD.

7. A record carrier according to claim 1, wherein said record carrier is a hybrid record carrier comprising a read-only part and a write part.

10. A device for reading the record carrier (10) according to claim 1, the device comprising first reading means for reading the digital work (DW) from the record carrier and second reading means for reading access information (KLT) for gaining access to the digital work and a secondary channel (HC) in which secondary channel information (KLK) is stored which is used for encrypting, decrypting or verifying the access information from the record carrier, the secondary channel (HC) and the access information being stored on the record carrier on substantially the same physical location.

8. A method for recording a digital work (DW) on a record carrier (10), the method comprising the following steps:

recording the digital work (DW) on the record carrier,

recording access information (KLT) for gaining access to the digital work and a secondary channel (HC) in which secondary channel information (KLK) is stored which is used for encrypting, decrypting or verifying the access information on the record carrier, the secondary channel (HC) and the access information being recorded on the record carrier on substantially the same physical location.

9. A device for recording a digital work (DW) on a record carrier (10), the device comprising first recording means for recording the digital work (DW) on the record carrier and second recording means for recording access information (KLT) for gaining access to the digital work and a secondary channel (HC) in which secondary channel information (KLK) is stored which is used for encrypting, decrypting or verifying the access information on the record carrier, the second recording means being adapted for recording the secondary channel (HC) and the access information on the record carrier on substantially the same physical location.