This oversimplistic explanation misses the facts, laid out to some extent in Stephen Walli&#x27;s history which is mentioned elsewhere on this page, that the &quot;proprietary software&quot; comprised GPL-licenced things like GCC and many BSD-licenced things including large portions of the command-line toolset.<p>Actually reading the licence dialogue displayed by the SFUA&#x2F;SUA installer was interesting: umpteen different iterations of mostly the same BSD licences, over and over, with the only differences being the copyright declarations.