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.
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About Steve Ballmer
Steve Ballmer was a contemporary American businessman and investor. Steven Anthony Ballmer is an American businessman and investor who was the chief executive officer of Microsoft from 2000 to 2014. He is the owner of the Los Angeles Clippers of the National Basketball Association (NBA), and a co-founder of the Ballmer Group, a philanthropic investment company. Read more on Wikipedia →