Method for combining transfer functions and predetermined key creation
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Accused Products
Abstract
A method for combining transfer functions with predetermined key creation. In one embodiment, digital information, including a digital sample and format information, is protected by identifying and encoding a portion of the format information. Encoded digital information, including the digital sample and the encoded format information, is generated to protect the original digital information. In another embodiment, a digital signal, including digital samples in a file format having an inherent granularity, is protected by creating a predetermined key. The predetermined key is comprised of a transfer function-based mask set to manipulate data at the inherent granularity of the file format of the underlying digitized samples.
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Citations
38 Claims
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1-5. -5. (canceled)
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6. A method for protecting a digital signal, comprising the steps of:
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providing a digital signal comprising digital data and file format information defining how the digital signal is encoded; creating a predetermined key to manipulate the digital signal; and manipulating the digital signal using the predetermined key to generate at least one permutation of the digital signal parameterized by the file format information defining how the digital signal is encoded. - View Dependent Claims (7, 9, 11, 12, 13, 14, 18)
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8. (canceled)
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10. (canceled)
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15-17. -17. (canceled)
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19. (canceled)
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20. A method for protecting a digital signal, comprising the steps of:
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providing a digital signal comprising digital data and file format information describing how the digital signal is encoded; creating a predetermined key comprising a mask set; manipulating the digital signal using the predetermined key wherein the manipulation is parameterized by the file format information describing how the digital signal is encoded; authenticating the predetermined key during playback of the digital data; and metering the playback of the digital data to monitor content. - View Dependent Claims (21)
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22-29. -29. (canceled)
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30. A method for protecting digital data, where the digital data is organized into a plurality of frames, each frame having i) a header comprising file format information and ii) at least a portion of the digital data, said method comprising the steps of:
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creating a predetermined key to manipulate the file format information in one or more of the plurality of frames wherein the file format information defines how the digital data is encoded; and manipulating the file format information using the predetermined key in at least two of the plurality of frames wherein the file format information defines how the digital data is encoded, such that the digital data will be perceived by a human as noticeably altered if it is played without using a decode key to restore the file format information to a prior state.
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31. (canceled)
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32. A system for scrambling a digital signal comprising:
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a receiver for receiving a digital signal comprising digital data and file format information defining how the digital signal is encoded; a key generator for generating a predetermined key to manipulate the digital signal; and a scrambler for manipulating the digital signal using the predetermined key to generate at least one permutation of the digital signal parameterized by the file format information defining how the digital signal is encoded. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification