Method and apparatus for recording of encrypted digital data
First Claim
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1. A method of recording transmitted digital data, comprising:
- receiving the transmitted digital data comprising scrambled data and encrypted transmitted digital information;
decrypting the encrypted transmitted digital information to obtain transmitted digital information, wherein the transmitted digital information comprises a control word, and wherein the control word is used to descramble the scrambled data;
re-encrypting the transmitted digital information using a recording encryption key;
storing the re-encrypted transmitted digital information and the scrambled data by a recording means on a recording support medium;
encrypting the recording encryption key by a recording transport key; and
storing the encrypted recording encryption key to the recording support medium,wherein at least one of the recording encryption key and the recording transport key is stored on a portable security module associated with the recording means.
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Abstract
A method relating to recording transmitted digital data in which transmitted digital information is encrypted by a recording encryption key. The recording encryption key is stored by a recording means on a recording support medium. Further, the recording encryption key is characterized in that an equivalent of the recording encryption key is encrypted by a recording transport key, which is also stored on the support medium with the encrypted information.
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Citations
24 Claims
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1. A method of recording transmitted digital data, comprising:
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receiving the transmitted digital data comprising scrambled data and encrypted transmitted digital information; decrypting the encrypted transmitted digital information to obtain transmitted digital information, wherein the transmitted digital information comprises a control word, and wherein the control word is used to descramble the scrambled data; re-encrypting the transmitted digital information using a recording encryption key; storing the re-encrypted transmitted digital information and the scrambled data by a recording means on a recording support medium; encrypting the recording encryption key by a recording transport key; and storing the encrypted recording encryption key to the recording support medium, wherein at least one of the recording encryption key and the recording transport key is stored on a portable security module associated with the recording means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for recording transmitted digital data, comprising:
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a receiver/decoder for at least; receiving the transmitted digital data, wherein the transmitted digital data comprises scrambled data and encrypted transmitted digital information, wherein the encrypted transmitted digital information comprises a control word used to descramble the scrambled data; decrypting the encrypted transmitted digital information to obtain the control word, wherein the transmitted digital data is re-encrypted using a recording encryption key; and a recording means for recording the re-encrypted transmitted digital information to a recording support medium, along with an encrypted recording encryption key, wherein the recording encryption key is encrypted via a recording transport key to obtain the encrypted recorded encryption key. - View Dependent Claims (20, 21)
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22. A system for recording transmitted digital data comprising scrambled data and encrypted transmitted digital information, comprising:
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a recording support medium configured to store the encrypted transmitted digital information, and an encrypted recording encryption key, wherein the encrypted transmitted digital information comprises a control word used to descramble the scrambled data, wherein the transmitted digital information is re-encrypted using a recording encryption key, and wherein the encrypted recording encryption key is encrypted using a recording transport key; and a portable security module configured to store at least one of the recording encryption key and the recording transport key.
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23. A recording support medium, comprising:
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transmitted digital data, wherein the transmitted digital data comprises scrambled data and encrypted transmitted digital information, wherein the encrypted transmitted digital information comprises a control word used to descramble the scrambled data, and wherein the encrypted transmitted digital information is decrypted to obtain the control word, wherein the decrypted transmitted digital information is re-encrypted using a recording encryption key; and an encrypted recording encryption key, wherein the encrypted recording encryption key is encrypted using a recording transport key.
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24. A receiver/decoder used in a conditional access digital television system, comprising:
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means for receiving transmitted digital data comprising scrambled data and encrypted transmitted digital information, wherein the encrypted transmitted digital information comprises a control word used to descramble the scrambled data; and means for decrypting the encrypted transmitted digital information to obtain the control word; wherein the transmitted digital data is re-encrypted using a recording encryption key, wherein the recording encryption key is encrypted via a recording transport key to obtain an encrypted recorded encryption key, and wherein the receiver/decoder is operatively connected to a recording means for recording the re-encrypted transmitted digital information and the encrypted recording encryption key to a recording support medium.
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Specification