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Watermark. A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [1] Watermarks have been used on postage stamps, currency, and other ...
Digital watermarking. A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. [1] It is typically used to identify ownership of the copyright of such a signal. Digital watermarking is the process of hiding digital information in a carrier signal; the hidden information should, [2 ...
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Security printing. Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards. The main goal of security printing is to prevent forgery, tampering, or ...
Postage stamp paper is the foundation or substrate of the postage stamp to which the ink for the stamp's design is applied to one side and the adhesive is applied to the other. The paper is not only the foundation of the stamp but it has also been incorporated into the stamp's design, has provided security against fraud and has aided in the ...
Known for. Analysis of paper and watermarks. Allan Henry Stevenson (June 20, 1903 – March 31, 1970) was an American bibliographer specializing in the study of handmade paper and watermarks who "single-handedly created a new field: the bibliographical analysis of paper." [1] Through his pioneering studies of watermarks, Stevenson solved "the ...
Worldwide. Products. Paper, envelopes. Parent. Arjo Wiggins. Website. www.arjowigginscreativepapers.com. Conqueror is a manufacturer of distinctive, high-quality watermarked paper in the United Kingdom. The company was founded in the late 1880s by E.P. Barlow, director of the London -based stationer Wiggins Teape.
A number of authentication systems are known by the general term of "watermarking" methods, since they rely on embedding authentication information into another information bearer, by analogy with the watermarking of paper.