Method and apparatus for an adapter card providing conditional access in a communication system
First Claim
Patent Images
1. An apparatus comprising:
- a receiving unit configured to receive frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, wherein each of the plurality of different data streams is encrypted with a different key, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using a key obtained in accordance with the identifying information; and
an output unit configured to determine in accordance with the identifying information of a frame received by said receiving unit whether or not a key is available to decrypt the encrypted data of the frame, and where available to output decrypted data, obtained from the encrypted data of the frame by using the key, through a bus interface to a computer for further processing by the computer.
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Abstract
A method and apparatus for an adapter card, for use in a computer, to provide conditional access by the computer to incoming data streams while maintaining the security of information by maintaining a listing of addresses corresponding to data streams which the computer is authorized to receive, receiving and determining the address of a frame, determining whether the frame address matches an address maintained in an Access Table, and processing and transmitting only those frames of data streams which the computer is authorized to receive.
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Citations
30 Claims
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1. An apparatus comprising:
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a receiving unit configured to receive frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, wherein each of the plurality of different data streams is encrypted with a different key, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using a key obtained in accordance with the identifying information; and an output unit configured to determine in accordance with the identifying information of a frame received by said receiving unit whether or not a key is available to decrypt the encrypted data of the frame, and where available to output decrypted data, obtained from the encrypted data of the frame by using the key, through a bus interface to a computer for further processing by the computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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receiving frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, wherein each of the plurality of different data streams is encrypted with a different key, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decrytion using a key obtained in accordance with the identifying information; determining in accordance with the identifying information of a frame receiving in said receiving step whether or not a key is available to decrypt the encrypted data of the frame, and where available outputting decrypted data, obtained from the encrypted data of the frame by using the key, through a bus interface to a computer for further processing by the computer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus comprising:
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a receiving unit configured to receive frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, wherein each of the plurality of different data streams is encrypted with a different key, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using a key obtained in accordance with the identifying information; and a determining unit configured to determine accordance with the identifying information of a frame whether or not a key is available to decrypt the encrypted data of the frame, wherein said apparatus is an adapter card connectable to a computer. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method comprising:
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receiving frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, wherein each of the plurality of different data streams is encrypted with a different key, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using a key obtained in accordance with the identifying information; and determining in accordance with the identifying information of a frame received by said receiving step whether or not a key is available to decrypt the encrypted data of the frame, wherein said method is effected by using an adapter card connectable to a computer. - View Dependent Claims (24, 25, 26, 27, 28)
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29. An apparatus comprising:
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a receiving unit configured to receive frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using one of a plurality of different keys, the one key being obtained in accordance with the identifying information; and an output unit configured to determine in accordance with the identifying information of a frame received by said receiving unit whether or not a key is available to decrypt the encrypted data of the frame, and where available to output decrypted data, obtained from the encrypted data of the frame by using the key, through a bus interface to a computer for further processing by the computer.
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30. An apparatus comprising:
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a receiving unit configured to receive frames from a satellite antenna, wherein each frame corresponds to one of a plurality of different data streams, and wherein each frame comprises (a) identifying information uniquely identifying that one of the plurality of different data streams to which the frame corresponds and (b) encrypted data for decryption using one of a plurality of different keys, the one key being obtained in accordance with the identifying information; and a determining unit configured to determine accordance with the identifying information of a frame whether or not a key is available to decrypt the encrypted data of the frame, wherein said apparatus is an adapter card connectable to a computer.
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Specification