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: Miklós Horthy de Nagybánya was a Hungarian admiral and statesman, who served as Regent of the Kingdom of Hungary between World Wars I and II and throughout most of World War II, from 1 March 1920 to 15 October 1944.