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document, the characteristic, by pressure generated in parallel with the tintenindizes correct characteristic watermark system and method of its manufacture.
document, the characteristic, by pressure generated in parallel with the tintenindizes correct characteristic watermark system and method of its manufacture.
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机译:在文献中,通过与锡纸平行产生的压力来表征特征,从而正确地形成了特征水印系统及其制造方法。
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摘要
A document security system is provided by providing each document with a synthetic watermark, for instance using the process, compositions and apparatus disclosed in the aforementioned U.S. patent of Norris, et al and, within the perimeter of at least one of the symbols which is provided by the synthetic watermark, an identical complementary or otherwise corresponding symbol is printed using ink, paint, dye, stain or similarly contrastingly pigmented substance so as to create, in combination with the synthetic watermark a juxtaposition that can be looked-for as evidence that the document is genuine and its serial number unaltered.
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