System for securing access to data streams
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Abstract
A method and an apparatus for protecting digital content, in which an output format for received compressed encrypted digital content is determined based, at least in part, on a rule determining whether clear compressed output format is allowed. When the clear compressed output format is not allowed, the content is received in a form in which it has been encrypted by at least two different encryption methods, and processing of the content comprises a combination of decrypting in accordance with one of the encryption methods and decompression in an atomic operation.
60 Citations
67 Claims
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1-47. -47. (canceled)
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48. A method for protecting digital content, the method comprising:
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receiving compressed encrypted digital content; determining an output format based, at least in part, on a rule determining whether a clear compressed output format is allowed; and processing the compressed encrypted digital content so that any output produced will conform with the determined output format; wherein, when the rule does not allow the clear compressed output format, (a) the compressed encrypted digital content is received in a form in which the compressed encrypted digital content has been encrypted by at least a first encryption method and a second encryption method, and (b) the processing step comprises a combination of decrypting in accordance with the second encryption method and decompressing, the decrypting and decompressing combination being an atomic operation so that the decrypting and decompressing can be performed only together and cannot be performed separately. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. An apparatus for protecting digital content, the apparatus comprising:
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a digital content receiver for receiving compressed encrypted digital content; an output format determination unit for determining an output format based, at least in part, on a rule determining whether a clear compressed output format is allowed; and a processor for processing the compressed encrypted digital content so that any output produced will conform with the determined output format; wherein, when the rule does not allow the clear compressed output format, (a) the compressed encrypted digital content is received in a form, in which the compressed encrypted digital content has been encrypted by at least a first encryption method and a second encryption method, and (b) the processing comprises a combination of decrypting in accordance with the second encryption method and decompressing, the decrypting and decompressing combination being an atomic operation so that the decrypting and decompressing can be performed only together and cannot be performed separately. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification