ABSTRACT
In the traditional manufacture of paper, wet fiber is subjected to high pressure to expel the moisture. If the press’ mold has a slight pattern, this pattern leaves an imprint, a watermark, in the paper, best viewed under transmitted light. Now the old word “watermark” has been borrowed by high technology. Digital watermarks are imperceptible or barely perceptible transformations of digital data; often the digital data set is a digital multimedia object. While digital images are most often mentioned in the same breath as digital watermarking, we note that watermarks can be applied to other forms of digital data, for example, videos and music.
