Steganographic method and device
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus and method for encoding and decoding additional information into a stream of digitized samples in an integral manner. The information is encoded using special keys. The information is contained in the samples, not prepended or appended to the sample stream. The method makes it extremely difficult to find the information in the samples if the proper keys are not possessed by the decoder. The method does not cause a significant degradation to the sample stream. The method is used to establish ownership of copyrighted digital multimedia content and provide a disincentive to piracy of such material.
151 Citations
65 Claims
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1-24. -24. (canceled)
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25. A method for identifying content comprising the step of:
decoding additional information including a watermark from the content using a key. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for identifying content comprising the step of:
encoding additional information including a watermark into content using a key. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A method for tamper proofing content, the method comprising:
- calculating a one way function of additional information including a watermark to be encoded into the content such that the one way function is insensitive to the encoding process; and
encoding the additional information into the content. - View Dependent Claims (61)
- calculating a one way function of additional information including a watermark to be encoded into the content such that the one way function is insensitive to the encoding process; and
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62. A system for watermarking content:
- the system configured to differentiate between a plurality of copies of content using a steganographic cipher.
- View Dependent Claims (63, 64, 65)
Specification