초록 ▼

A record carrier for storing a digital work (DW) includes 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 t

A record carrier for storing a digital work (DW) includes 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.

대표청구항 ▼

1. A non-transitory machine-readable record carrier storing a digital work, said record carrier comprising: a first data area at a first physical location on the record carrier storing machine-readable access information controlling access to the digital work, anda second, re-writable data area comp

1. A non-transitory machine-readable record carrier storing a digital work, said record carrier comprising: a first data area at a first physical location on the record carrier storing machine-readable access information controlling access to the digital work, anda second, re-writable data area comprising a secondary channel and located substantially at the first physical location on the record carrier, the secondary channel storing secondary channel information used for encrypting, decrypting or verifying the access information, wherein the secondary channel information is re-written when the access information has changed. 2. The non-transitory machine readable record carrier as claimed in 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. The non-transitory machine readable record carrier as claimed in claim 1, wherein the access information is usage right information defining one or more conditions which must be satisfied in order for the usage right to be exercised. 4. The non-transitory machine readable record carrier as claimed in claim 1, wherein the secondary channel is a hidden channel which is not accessible by non-compliant reproducing devices. 5. The non-transitory machine readable record carrier as claimed in claim 1, wherein said record carrier is a recordable optical disc. 6. The non-transitory machine readable record carrier claimed in claim 5, wherein the recordable optical disc is one of a CD and a DVD. 7. The non-transitory machine readable record carrier as claimed in claim 1, wherein said record carrier is a hybrid record carrier comprising a read-only part and a write part. 8. The non-transitory machine readable record carrier according to claim 1, wherein the secondary channel is stored on the hidden channel underneath the access information. 9. A method for recording a digital work on a record carrier, the method comprising the following steps: recording the digital work on the record carrier;recording access information for gaining access to the digital work and a secondary channel in which re-writable secondary channel information is stored which is used for encrypting, decrypting or verifying the access information on the record carrier, the secondary channel and the access information being recorded at substantially the same physical location on the record carrier, wherein the secondary channel information is re-written when the access information has changed. 10. A device for recording a digital work on a record carrier, the device comprising: first recording means for recording the digital work on the record carrier; andsecond recording means for recording access information for gaining access to the digital work and a secondary channel in which re-writable secondary channel information is stored which is used for encrypting, decrypting or verifying the access information on the record carrier, the second recording means recording the secondary channel and the access information at substantially the same physical location on the record carrier, wherein the secondary channel information is re-written when the access information has changed. 11. A device for reading a record carrier for storing a digital work, wherein the record carrier comprises access information for gaining access to the digital work, and a secondary channel in which secondary channel information is stored which is used for encrypting, decrypting or verifying the access information, wherein the secondary channel is stored on the record carrier at substantially the same physical location as the access information, the device comprising: first reading means for reading the digital work from the record carrier: andsecond reading means for reading access information for gaining access to the digital work and a secondary channel in which secondary channel information is stored which is used for encrypting, decrypting or verifying the access information from the record carrier, the secondary channel and the access information being stored at substantially the same physical location on the record carrier, wherein the secondary channel information is re-written when the access information has changed.