The invention provides a method of forensic digital watermarking that randomly selects an orientation and/or embedding protocol for a digital watermark signal to be embedded in the content signal. It then embeds the digital watermark signal at the selected orientation in the content signal. The embedding applies a different orientation to the forensic watermark for each instance of embedding a watermark. This thwarts averaging and over-embedding attacks.

 
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< Forensic digital watermarking with variable orientation and protocols

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