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A digital watermark is called robust with respect to transformations if the embedded information may be detected reliably from the marked signal, even if degraded by any number of transformations.
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]
Copy-evident documents have features that make it detectable that a copy is not the original.. In security printing, various methods such as void pantograph are used to create patterns that are hard to copy exactly and when copied inexactly produces an easily detectable image.
Marca (Spanish pronunciation:), stylised as MARCA, is Spain's national daily tabloid sport newspaper owned by Unidad Editorial. The newspaper focuses primarily on football , in particular the day-to-day activities of Real Madrid , FC Barcelona , and Atlético Madrid .