A method for generating at least one security feature in a flat substrate, as well as security or value document

A method for generating at least one security feature in a flat substrate (1), comprising the following method steps: (A) generating each of n groups of recesses (2) in at least a region on at least one side of the flat substrate (1) and / or n groups of perforations (3) in at least one area of ​​the flat substrate (1), wherein n is an integer greater than 1, and thereafter (B) filling the recesses (2) of the n groups of recesses (2) and / or the openings (3) of the n groups of perforations (3) with a filling material (4), so that a flat surface on each of the recesses (2) and / or apertures (3) provided side of the flat substrate (1) is formed, wherein in the filler (4) of each group of recesses (2) and / or any group of perforations (3) in each case at least one marking substance is that of the marking substances each other group of recesses (2) and / or each other group of apertures (3) is different, and wherein the filler material (4) and the material of the flat substrate (1) are formed from the same base polymer and the flat substrate (1) does not contain the marker substances.