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: Errol Walton Barrow was a Caribbean statesman and the first Prime Minister of Barbados. Born into a family of political and civic activists in the parish of Saint Lucy, he was educated at Harrison College. He was also known as "Dipper Barrow" within the country itself.