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Cryptography may also support the embedding of digital "watermarks" into specific pieces of intellectual property to facilitate tracing the theft to an original copy. Such a scheme would insert information that would not affect the use of the object but could be subsequently identified should ownership of that work be called into question. For example, a digital watermark might embed information into a digital representation of a photograph in such a way that it did not affect the visual presentation of the photograph; nevertheless, if the photograph were copied and distributed, all subsequent copies would have that hidden information in them.



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