The invention relates to a first product (20) which supports identification information (30) and a second product (22) which, optionally, supports identification information (30′). Said first and second products are maintained and transported together by a clamp (12), such that the second printing product (22) at least partially overlaps the first printing product (20). The identification information (30) of the first printing product (20) is arranged in the edge section (26) and the identification information (30′) of the second printing product (22) is free. The printing products (22, 22) are subjected to an optical-electronic control where an image capturing device (38) captures an image of the identification information (30, 30′), when a control point is passed. The captured image is electronically processed and the result thereof is transformed into control signals.