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Watermarks are one of the oldest technologies designed to offer proof of something’s origins. Centuries after their first use on banknotes, stamps, and luxury writing papers, the concept of the watermark has found a valuable place in the digital world, where copying is easy and proof of provenance hard. In the book world, we are most familiar with the watermark concept taking the form of DRM (digital rights management), an additional layer applied to a digital file to prevent copying or manipulation.