System and method of restricting recording of contents using device key of content playback device
AssigneeSamsung Electronics Co., Ltd.
InventorMi Suk Huh
Life of this patent
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Abstract
The present invention relates to a system and method for restricting recording of contents using a device key of a content reproduction device. A content recording device includes a content recording unit for encrypting contents using a Content Encryption Key (CEK) and recording the encrypted contents in a recording medium; a CEK transmitting/receiving unit for transmitting the CEK to at least one content reproduction device, and receiving, from the at least one content reproduction device, an encrypted CEK being encrypted using a device key of each of the at least one content reproduction device; and a CEK recording unit for recording the encrypted CEK in the recording medium.
Claims19
A content recording device, comprising:
- a content recorder configured to encrypt contents using a Content Encryption Key (CEK) and configured to record the encrypted contents in a recording medium and configured to check a redistribution control descriptor in the recorded content and to check revocation list of valid version;
- a CEK transmitter/receiver configured to form a secure channel to transmit the CEK to at least one content reproduction device based on the checking of the revocation list with respect to the content reproduction device, and configured to receive, from the at least one content reproduction device over the secure channel, an encrypted CEK being encrypted using a device key of each of the at least one content reproduction device;
- and a CEK recorder configured to record the encrypted CEK in the recording medium.
A content reproduction device, comprising:
- a content recording device configured to check a redistribution control descriptor in the recorded content and to check revocation list of valid version for the purpose of redistribution of contents and a revocation list;
- a CEK encryptor configured to encrypt a CEK with respect to contents using a device key;
- and a CEK transmitter/receiver configured to receive the CEK from secure channel to the content recording device when the content reproduction device is excluded based on the checking of the revocation list, and configured to transmit over secure channel to an encrypted CEK being encrypted using the device key in the content recording device.
A method for recording contents, the method comprising:
- encrypting contents using a Content Encryption Key (CEK), and recording the encrypted contents in a recording medium by a content recording device;
- transmitting the CEK to at least one content reproduction device by the content recording device, the content recording device configured to check a redistribution control descriptor in the recorded content and to check a revocation list (rl) of valid version;
- encrypting, by each of the at least one content reproduction device, the CEK using a device key of each of the at least one content reproduction device based on the checking of the revocation list;
- receiving the encrypted CEK from each of the at least one content reproduction device from a secure channel;
- and recording, in the recording medium by the content recording device, the encrypted CEK.
A non-transitory computer-readable recording medium storing a program implementing a method for recording contents, the method comprising:
- encrypting contents using a Content Encryption Key (CEK), and recording the encrypted contents in a non-transitory recording medium by a content recording device, the content recording device configured to check a redistribution control descriptor in the recorded content and to check revocation list of valid version;
- transmitting the CEK from secure channel to at least one content reproduction device by the content recording device based on the checking of the revocation list with respect to the content reproduction device;
- encrypting, by each of the at least one content reproduction device, the CEK using a device key of each of the at least one content reproduction device;
- receiving from a secure channel the encrypted CEK from each of the at least one content reproduction device;
- and recording, in the non-transitory recording medium by the content recording device, the encrypted CEK.
Dependencies are inferred from the claim text.