Nuremberg Laws

This illustration explains the Blutschutzgesetz: In general, the light (or the cross) symbols stand for German-blooded, the dark symbols for Jew. In general: No restriction if both people are German-blooded; If one of them is Quarter-Jew (Mischling 2. Grades) also no problem; Half-Jews need a special permission to marry people of German blood (no such permissions were actually given); People that are more than half-Jew are not permitted to marry (or have sex with) German-blooded people

The Nuremberg Laws is the name for three (historically two) antisemitic laws that were set into practice in Germany in 1935, and that were valid until 1945. They are named after the city of Nuremberg where the legislative assembly met.

They were:

On the 14th of November 1935, the Nuremberg laws were expanded prohibiting Roma (Gypsies), Blacks or any of their offspring from engaging in marriage or sexual relations with 'Those of German or German related blood'.