Watermark

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Watermark

An image in a piece of paper that may be seen more clearly when it is held up to light. This is used in printing some money and passports to prevent counterfeiting. For example, if one holds a $20 American bill up to light, one would see a watermark of Andrew Jackson's face.
References in periodicals archive ?
It is reasonable to assume that [??] estimated from watermarked audio is similar to the [??] from the corresponding an unwatermarked audio clip given that embedding and attack-channel distortion are imperceptible.
Standard specification for white watermarked and unwatermarked bond, mimeo, spirit duplicator, xerographic, and laser printer cut-sized office papers.
Content owners, unlike users, have access to or ownership of the original, unwatermarked content with which to compare their digital images.
The autograph is written in blackish-brown ink on a single sheet of cream-colored, unwatermarked wove paper thirty-four centimeters high and fifty-four centimeters wide, which has been folded into a folio yielding two leaves - or four pages - each twenty-seven centimeters in width.
The paper is unwatermarked, ruled as a notebook, and largely in George Eliot's purple and blue ink.