Sam Williams. “7. A Stark Moral Choice”. Free as in freedom. ISBN0-596-00287-4. https://www.oreilly.com/openbook/freedom/ch07.html. "According to the developer, Gosling, while a Ph.D. student at Carnegie Mellon, had assured early collaborators that their work would remain accessible. When UniPress caught wind of Stallman's project, however, the company threatened to enforce the copyright."
