Method and system for digital watermarking
DCFirst Claim
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1. A system for applying a digital watermark to a content signal, the signal comprising;
- a receiver for receiving at least one digital watermark and at least one key comprising information describing where in the content signal the at least on digital watermark is to be encoded;
an encoder for encoding the at least one digital watermark into the content signal according to the at least one key to produce at least one watermarked content signal; and
a decoder for detecting and/or decoding the at least one digital watermark from a watermarked content signal using the at least one key.
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Abstract
A method for applying a digital watermark to a content signal is disclosed. In accordance with such a method, a watermarking key is identified. The watermarking key includes a binary sequence and information describing application of that binary sequence to the content signal. The digital watermark is then encoded within the content signal at one or more locations determined by the watermarking key.
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Citations
26 Claims
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1. A system for applying a digital watermark to a content signal, the signal comprising;
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a receiver for receiving at least one digital watermark and at least one key comprising information describing where in the content signal the at least on digital watermark is to be encoded; an encoder for encoding the at least one digital watermark into the content signal according to the at least one key to produce at least one watermarked content signal; and a decoder for detecting and/or decoding the at least one digital watermark from a watermarked content signal using the at least one key. - View Dependent Claims (2, 3, 4, 5, 6, 26)
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7. A method for watermarking a content signal with a plurality of functions, including the input of at least a key and a digital watermark, the method configured to be executed by a computer programmed to perform the steps of:
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providing a key generated by the following steps; generating a random sequence of binary numbers; and generating information describing the application of the random sequence to the content signal wherein combining the random sequence and the generated information forms the key; providing a digital watermark to be encoded; encoding the digital watermark using at least the key and the plurality of functions to produce a watermarked content signal; and detecting at least a portion of the digital watermark from a watermark content signal using the key. - View Dependent Claims (8, 9, 10, 11)
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12. A system for watermarking at least one content signal, the system comprising:
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a digital watermark encoder; and a digital watermark decoder; said digital watermark encoder being configured to encode at least one digital watermark into locations in the content signal using at least one key comprising information describing where in the content signal the at least one watermark is to be encoded; and said digital watermark decoder being configured to detect and/or decode at least one digital watermark from an encoded content signal using the at least one key. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device for decoding digital watermarks, the device comprising:
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a receiver for receiving a content signal steganographically encoded with at least one steganographic digital watermark using at least one key comprising information describing where in the content signal the at least one digital watermark is to be encoded; and a decoder for decoding at least one steganographic digital watermark from the steganographically encoded content signal, wherein the device limits the ability to reverse the encoding. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification