Authentication of signals using watermarks
First Claim
1. A method of determining if at least a portion of a suspect signal is derived from a watermarked original signal comprising the steps of:
- providing a watermark;
creating the watermarked original signal by incorporating the watermark onto an original signal;
generating at least one first watermark indicator based on the watermarked original signal and the watermark;
generating at least one second watermark indicator based on the suspect signal and the watermark; and
determining a degree of authenticity of the suspect signal based on the at least one first watermark indicator and the at least one second watermark indicator.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of determining if at least a portion of a suspect signal (58) is derived from a watermarked original signal (56) includes the steps of providing a watermark (50) and creating the watermarked original signal (56) by incorporating the watermark (50) onto an original signal (52). At least one first watermark indicator is generated (64) based on the the watermarked original signal (56) and the watermark (50) and at least one second watermark indicator is generated (62) based on the suspect signal (58) and the watermark (50). A determination is made (66, 68, 70) whether at least a portion of the suspect signal (58) is derived from the watermarked original signal (56) is made based on the at least one first watermark indicator (64) and the at least one second watermark indicator (62).
149 Citations
38 Claims
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1. A method of determining if at least a portion of a suspect signal is derived from a watermarked original signal comprising the steps of:
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providing a watermark;
creating the watermarked original signal by incorporating the watermark onto an original signal;
generating at least one first watermark indicator based on the watermarked original signal and the watermark;
generating at least one second watermark indicator based on the suspect signal and the watermark; and
determining a degree of authenticity of the suspect signal based on the at least one first watermark indicator and the at least one second watermark indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of determining if a second signal is derived from a first signal comprising the steps of:
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generating at least one first watermark indicator based on the first signal and a watermark;
generating at least one second watermark indicator based on the second signal and the watermark; and
deriving an overall indicator indicating a degree of authenticity of the second signal based on the at least one first and at least one second watermark indicators, and determining if at least a portion of the suspect signal is derived from a portion of the original signal based on the overall indicator. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification