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Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
The publications of the Institute for Computerized Bibliography of the Hebrew Book dealt with three components of the sheets, namely paper, watermark and typography. Regarding the identification of those sheets, they wrote: "In our opinion, these are the sheets from the printing experiments of Prokop Waldvogel and Davin de Caderousse".
True watermark. A true watermark is a recognizable image or pattern in paper that appears lighter or darker than surrounding paper when viewed with a light from behind the paper, due to paper density variations. A watermark is made by impressing a water coated metal stamp or dandy roll onto the paper during manufacturing.
The resulting watermark is generally much clearer and more detailed than those made by the Dandy Roll process, and as such, Cylinder Mould Watermark Paper is the preferred type of watermarked paper for banknotes, passports, motor vehicle titles, and other documents where it is an important anti-counterfeiting measure.
Barack Obama's birth certificate on security paper.. Security paper is a paper used in security printing that incorporates features that can be used to identify or authenticate a document as original, e.g., watermarks or invisible fibres in paper, or features that demonstrate tamper evidence when fraud is attempted, e.g., to remove or alter print such as amounts or signatures on a cheque.
Paper that is off-white or with a brownish or buffish tinge is called toned paper. Cook Islands SC#1-4; Romania SC#166-172; Watermarked: Elephant head watermark used on early stamps of India: A watermark is created in the paper by the mould or the Dandy roll and can be letters or designs. India SC#19-25; U.S. SC#264-278; Wove
Machine Identification Code, also known as Printer steganography – Digital watermark tracking code produced by many printers; Traitor tracing – Method of tracing the source of leaked data; Watermark – Identification on paper to prevent counterfeiting
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.