METHOD AND DEVICES FOR REPRODUCING ENCRYPTED CONTENT AND APPROVING REPRODUCTION
First Claim
1. A method of reproducing encrypted content in a device connected to a network, the method comprising:
- receiving the encrypted content to be reproduced;
requesting a token for decrypting the received content from an external device containing a first partial key of the device via the network;
receiving the requested token from the external device; and
decrypting the received token by using a second partial key contained in the device.
1 Assignment
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Accused Products
Abstract
A reproduction method capable of immediately revoking a leaked device key by dividing the device key into a first partial key and a second partial key is provided. The reproduction method includes the operations of receiving encrypted content to be reproduced, requesting a token for decrypting the received content from an external device containing a first partial key of a device via a network, receiving the requested token from the external device, and decrypting the received token by using a second partial key contained in the device, thereby preventing content encrypted and distributed before revocation of an illegally copied device from being reproduced, and minimizing damage due to key leakage.
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Citations
18 Claims
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1. A method of reproducing encrypted content in a device connected to a network, the method comprising:
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receiving the encrypted content to be reproduced; requesting a token for decrypting the received content from an external device containing a first partial key of the device via the network; receiving the requested token from the external device; and decrypting the received token by using a second partial key contained in the device. - View Dependent Claims (2, 3, 4)
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5. A method of approving reproduction of encrypted content by a security mediated module connected to a network, the method comprising:
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receiving a request for a token for decrypting the encrypted content from a device; generating the token based on a partial key of the device, according to the received request, wherein the partial key is contained in the security mediated module; and transmitting the generated token to the device via the network. - View Dependent Claims (6, 7, 8)
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9. A reproduction device reproducing encrypted content and being connected to a network, the reproduction device comprising:
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an input unit which receives the encrypted content to be reproduced; a token processing unit which requests a token for decrypting the received content from an external device containing a first partial key of the reproduction device via the network, and receives the requested token; a decryption unit which decrypts the token received by the token processing unit, based on a second partial key contained in the reproduction device; and an output unit which reproduces the decrypted content. - View Dependent Claims (10, 11, 12)
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13. An approval device approving reproduction of encrypted content and being connected to a network, the approval device comprising:
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a token interface which receives a request for a token for decrypting the encrypted content from a reproduction device, and transmits the requested token; and a token generation unit which generates the requested token based on a partial key of the reproduction device, according to the received request, wherein the partial key is contained in the approval device. - View Dependent Claims (14, 15, 16)
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17. A computer readable recording medium having recorded thereon a program for executing a method of reproducing encrypted content in a device connected to a network, the method comprising:
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receiving encrypted content to be reproduced; requesting a token for decrypting the received content from an external device containing a first partial key of the device via the network; receiving the requested token from the external device; and decrypting the received token by using a second partial key contained in the device.
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18. A computer readable recording medium having recorded thereon a program for executing a method of approving reproduction of encrypted content by a security mediated module connected to a network, the method comprising:
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receiving a request for a token for decrypting the encrypted content from a device; generating the token based on a partial key of the device, according to the received request, wherein the partial key is contained in the security mediated module; and transmitting the generated token to the device via the network.
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Specification