From 1933 the National Socialists targeted ‘non-Aryans’ with an increasing number of professional bans and other discriminatory legislation. Anyone with a Jewish parent or grandparent was considered ‘non-Aryan’. A so-called Certificate of Aryan Descent (Ariernachweis) was required to prove ‘pure Aryan descent’. It consisted of birth, marriage, and death certificates or proof of ancestry, all of which had to be officially authenticated.

For more information (in German) see: LeMO NS-Regime – Ausgrenzung und Verfolgung – „Ariernachweis“ (dhm.de)