Linux is not in the public domain. Linux is a cancer that attaches itself in an intellectual property sense to everything it touches. That's the way that the license works.
Bio: Ernst Thälmann was the leader of the Communist Party of Germany during much of the Weimar Republic. He was arrested by the Gestapo in 1933 and held in solitary confinement for eleven years, before being shot in Buchenwald on Adolf Hitler's orders in 1944.