Process for the verification of the visible part of a digital document

A process for the verification of the visible part A of a digital document comprising a visible part A and a concealed part B , and the printed document C together with its pixel equivalent D corresponding thereto, comprising the steps of extracting a code E representing a text from D after generating the printout C , and concurrently, its digital equivalent, D , creating a code F from the visible portion of the original document, A , taking into account the concealed information, B , and comparing codes E and F for identity, and digitally signing the result of the comparison G to yield a digitally signed result, H