Importance

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Abstract

Electronic content data (e.g., audio or visual) can be steganographically encoded for a variety of purposes. One claim recites a method practiced by a first party, including the acts: (a) receiving content that has been previously steganographically encoded by a second party with first plural-bit data; and (b) utilizing a programmed electronic processor, further steganographically encoding the content with a second plural-bit data different than the first. The further encoding includes altering digital data representing human-perceptible attributes of the content, in a manner that is dependent on the content. Both of the first and second plural-bit data are represented in encoded content. Of course, a great variety of other claims, arrangements and features are provided.

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First Claim