History
The term "digital watermark" was first coined in 1992 by Andrew Tirkel and Charles Osborne.
Watermarks are identification marks produced during the paper making process. The first watermarks appeared in Italy during the 13th century, but their use rapidly spread across Europe. They were used as a means to identify the papermaker or the trade guild that manufactured the paper. The marks shown here were created by a wire sewn onto the paper mold. Watermarks continue to be used today as manufacturer's marks and to prevent forgery.
Read more about this topic: Digital Watermarking
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