System and method for conditional access key encryption
First Claim
1. A computer-implemented method of simulcasting multimedia content to enable seamless migration from a first multimedia receiver to a second multimedia receiver, the second multimedia receiver supporting at least one encryption algorithm not supported by the first multimedia receiver, the method comprising:
- encrypting a group of original multimedia channel keys using a first encryption algorithm decryptable by the first multimedia receiver to produce a first group of encrypted multimedia channel keys;
encrypting said same group of original multimedia channel keys using a second encryption algorithm decryptable by the second multimedia receiver to produce a second group of encrypted multimedia channel keys, the second encryption algorithm being developed after the first encryption algorithm, and the second multimedia receiver being developed after the first multimedia receiver; and
concurrently transmitting said first group of encrypted multimedia channel keys with said second group of encrypted multimedia channel keys to a plurality of multimedia subscribers having either the first multimedia receiver or the second multimedia receiver, wherein said first group of encrypted multimedia channel keys is decryptable by the first multimedia receiver and said second group of encrypted multimedia channel keys is decryptable by the second multimedia receiver but not the first multimedia receiver.
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Accused Products
Abstract
A system for processing multimedia channels is described comprising: transmitting decryption keys for decrypting the multimedia channels, the keys encrypted in both a first encryption format and a second encryption format; the keys encrypted in the first encryption format being decryptable by a first type of multimedia receiver; and the keys encrypted in the second encryption format being decryptable by a second type of multimedia receiver.
128 Citations
17 Claims
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1. A computer-implemented method of simulcasting multimedia content to enable seamless migration from a first multimedia receiver to a second multimedia receiver, the second multimedia receiver supporting at least one encryption algorithm not supported by the first multimedia receiver, the method comprising:
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encrypting a group of original multimedia channel keys using a first encryption algorithm decryptable by the first multimedia receiver to produce a first group of encrypted multimedia channel keys; encrypting said same group of original multimedia channel keys using a second encryption algorithm decryptable by the second multimedia receiver to produce a second group of encrypted multimedia channel keys, the second encryption algorithm being developed after the first encryption algorithm, and the second multimedia receiver being developed after the first multimedia receiver; and concurrently transmitting said first group of encrypted multimedia channel keys with said second group of encrypted multimedia channel keys to a plurality of multimedia subscribers having either the first multimedia receiver or the second multimedia receiver, wherein said first group of encrypted multimedia channel keys is decryptable by the first multimedia receiver and said second group of encrypted multimedia channel keys is decryptable by the second multimedia receiver but not the first multimedia receiver. - View Dependent Claims (2, 3, 4, 5)
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6. A system for processing multimedia channels to enable seamless migration from a first multimedia receiver to a second multimedia receiver, the second multimedia receiver supporting at least one encryption algorithm not supported by the first multimedia receiver, the system comprising:
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a computer readable storage medium having stored thereon original decryption keys for decrypting said multimedia channels, wherein each original decryption key is successively encrypted in both a first encryption algorithm and a second encryption algorithm to produce first and second encrypted decryption keys, respectively, the second encryption algorithm being developed after the first encryption algorithm, the second multimedia receiver being developed after the first multimedia receiver; a transmission component for concurrently transmitting said first group of encrypted multimedia channel keys with said second group of encrypted multimedia channel keys to a plurality of multimedia subscribers having either the first multimedia receiver or the second multimedia receiver; said decryption keys encrypted in said first encryption format algorithm being decryptable by the first multimedia receiver; and said decryption keys encrypted in said second encryption algorithm being decryptable by the second multimedia receiver but not the first multimedia receiver. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of simulcasting multimedia content to enable seamless migration from a first type of multimedia receiver to a second type of multimedia receiver, the method comprising:
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encrypting a channel key using a standard conditional access (“
CA”
) encryption algorithm decryptable by the first type of multimedia receiver to generate a first encrypted channel key;encrypting said channel key using a non-standard encryption algorithm decryptable by the second type of multimedia receiver but not by the first type of multimedia receiver, to provide a second encrypted channel key; concurrently transmitting the first and second encrypted channel keys to first and second multimedia receivers of the first type and second type, respectively; transmitting an encrypted channel to the first and second multimedia receivers; within the first multimedia receiver; decrypting the first encrypted channel key using a standard CA decryption algorithm to recover the channel key; and decrypting the encrypted channel using the channel key; and within the second multimedia receiver; decrypting the second encrypted channel key using a non-standard decryption to recover the channel key; and decrypting the encrypted channel using the channel key. - View Dependent Claims (17)
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Specification