I wish we could all get our terminology straight to avoid confusion. I hear too many “Linux == Unix” comments. Then we need to get straight what “Unix” is. Are we talking codebase, functionality or trademark (certified)? If we’re talking codebase, that’s Novell’s (sorry SCO). If we’re talking functionality, that’s a lot of operating systems equally, including Linux and BSD. If we’re talking trademark, only OS X, AIX, Solaris and HP-UX are allowed to be marketed as modern UNIX.
While we’re at it, I’d like to get rid of the term “Intellectual Property.” It causes and/or shows confusion in almost every thread I see it in.