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    But legally, it can only be called "UNIX" if it's certified by The Open Group. Commented Aug 21, 2012 at 19:26
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    It's not enough to be POSIX compliant to be Unix compliant (the Unix spec is a superset of the POSIX spec). It's enough to be Unix compliant enough in the eyes of the certifiers to be certified though. Commented Mar 26, 2013 at 21:50