About: isa:116747089   Sponge Permalink

An Entity of Type : prov:Entity, within Data Space : webisa.webdatacommons.org associated with source dataset(s)

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prov:value
  • The invention relates to a method of checking the authenticity of documents made of a non-conducting material, such as paper or plastic, and having a physical characteristic of which the value randomly changes over a number of sub-areas of a checking area, each of said documents further comprising a digital mark which is characteristic for the distribution of said value over said sub-areas.
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