Abstract: In order to protect a paper-thin valuable document or identification document on which an identification mark has been placed, for example by means of a printing technique or by a laser technique, in such a way that counterfeiting is extremely difficult, at least part of said identification mark is repeated at another point by changing the thickness of the document locally. At least part of the identification mark is thus clearly liked to the paper substrate.

Abstract: For security printing of documents, in particular banknotes, by printing a sheet or web using intaglio technology, an ink image is applied to transfer rollers (6) using rotary screen printing technology, said ink image is transferred from the transfer rollers to one or more intaglio plates which are provided with engravings and are fixed in or on the shell of a plate cylinder, and the ink present in the engravings of the intaglio plates is transferred to a sheet or web pressed against the plate cylinder (1) by a counter pressure cylinder (8).