The present invention relates to digital watermarking. In a preferred embodiment, a multi-channel media signal is embedded with first and second digital watermark components. The first component is embedded in a first of the channels and a second component is embedded in a second of the channels. The second component is registered with the first component so as to reduce visible attributes that are attributable to the first component.

 
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< Technique for producing through watermarking highly tamper-resistant executable code and resulting "watermarked" code so formed

< Region encoding using substantially undifferentiated marks

> Method and apparatus providing distributed authorization management of communication sessions

> Multi-layer graphical user interface
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