Mechanism for protecting the transfer of digital content
First Claim
1. A system in communication with a remote source and a digital device, comprising:
- means for receiving a mating key in response to prior transmission of a mating key generator and a serial number of the digital device to the remote source, the mating key being based on the mating key generator;
means for encrypting a descrambling key with the mating key, the descrambling key being used for scrambling digital content prior to transmission to the digital device; and
means for transmitting the mating key generator to the digital device.
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Accused Products
Abstract
According to one embodiment, a method for delivering a mating key to a smart card coupled to a decoding device with a built-in descrambler. The mating key is used by the smart card to encrypt the derived descrambling key for the specific decoder with descrambler. The corresponding mating key is a derivation calculated within the descrambler circuit using a unique value stored in the decoding device, and is of a message that comprises a unique predetermined value that identifies a manufacturer of the decoding device, the digital device targeted to receive the encrypted key data, and the service provider.
206 Citations
23 Claims
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1. A system in communication with a remote source and a digital device, comprising:
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means for receiving a mating key in response to prior transmission of a mating key generator and a serial number of the digital device to the remote source, the mating key being based on the mating key generator;
means for encrypting a descrambling key with the mating key, the descrambling key being used for scrambling digital content prior to transmission to the digital device; and
means for transmitting the mating key generator to the digital device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving a mating key; and
encrypting data used for scrambling digital content with the mating key, the mating key being a derivation of a message that comprises a predetermined value that identifies a manufacturer of a digital device targeted to receive the encrypted data. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus adapted to receive scrambled content and descramble the scrambled content, comprising:
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a removable smart card adapted to receive (i) a mating key generator and (ii) to encrypt a descrambling key with a mating key that is based on the mating key generator message; and
a descrambler component to receive the encrypted descrambling key and the mating key generator, the descrambler component performs a cryptographic operation on the mating key generator to produce a key that is equivalent to the mating key and decrypts the encrypted descrambling key using the key to recover a descrambling key, the descrambling key being used for descrambling scrambled content loaded into the set-top box. - View Dependent Claims (18, 19, 20)
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21. A digital device, comprising:
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a network interface to receive scrambled content; and
a descrambler component to (i) receive a mating key generator out-of-band from the digital content, at least one encrypted service key and a corresponding key identifier to indicates a tier of service associated with the encrypted service key over the network interface, (ii) perform a cryptographic operation on the mating key generator to produce a key, (iii) decrypt the encrypted service key to recover a service key, and (iv) descrambling the scrambled content using the service key. - View Dependent Claims (22, 23)
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Specification