Würth Elektronik GmbH & Co. KG is a leading manufacturer of PCBs in Europe. Multilayer technology in PCB production, also simply referred to as multilayer, is a technique in order to meet the increasing requirements in electronics. In the multilayer, the inner layer cores with the corresponding prepregs and the outer copper foils are arranged in „multilayer panels“. The individual layers are permanently bonded in a press under high pressure and high temperature. A data matrix code (DMC) is automatically applied at the edge of the production panel during production of the inner layer. In the multilayer technique, the inner layers are, however, covered by further copper foils, concealing the ID inside the PCB and rendering it illegible or impossible to assign.