The implementation of the personal identification card (Ausweis) in 1941 intensified the check on the Dutch population. People who were involved in illegal resistance activities, Jews who did not register, people in hiding, and people who refused to report for forced labour were at risk when carrying around their personal ID card, with which they could easily be identified. In the course of the war increasingly more people got involved in changing or forging personal identification cards.
Personal Identification Card Centre