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 ?
from the corresponding an unwatermarked audio clip given that embedding and attack-channel distortion are imperceptible.
High quality, unwatermarked, letter-sized images added to your demand letter can make your presentation instantly more dramatic, compelling and informative while showing your opponent that you've done the background research necessary to aggressively pursue the matter.
Which is why the components of new home entertainment systems probably would have to be designed not to play unwatermarked content.