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On October 9, 2003, a redesigned version of the $20 bill went into circulation in the U.S. Among other features, the bill includes watermarks that can be used to verify its authenticity. Traditional watermarking techniques are intended to prevent duplication, and digital watermarks have a similar purpose. They can be embedded into virtually any digital media, including images, audio and video, and...

https://scout.wisc.edu/report/nsdl/met/2003/1107