FORENSIC DIGITAL WATERMARKING WITH VARIABLE ORIENTATION AND PROTOCOLS

摘要

The invention provides a method of forensic digital watermarking (102) that randomly selects an orientation and/or embedding protocol for a forensic digital watermark (102) signal to be embedded in the content signal (100). It then embeds the forensic digital watermark (102) signal at the selected orientation in the content signal (100). The embedding applies a different orientation to the digital forensic watermark (102) for each instance of embedding a forensic watermark. This thwarts averaging and over-embedding attacks and enables generational forensic tracking.