| 摘要 |
Methods and apparatus for steganographically embedding information in media signals (e.g., audio and video) are provided. One claim recites a method of enabling tracing of a media signal to a distribution point of the media signal, including: providing time and place information associated with the distribution point, the distribution point includes at least speakers to render the media signal to an assembled audience; utilizing a programmed electronic processor, embedding the time and place information in the media signal, such that the time and place information is imperceptibly distributed in the media signal, said embedding alters data representing audible portions of the media signal or alters data representing video picture elements of the media signal to convey the time and place information in the media signal; and at least the place information is recoverable from plural different portions of the media signal. Of course, other claims, combinations and features are also provided.
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