When AT&T balkanized its Unix holdings in 1993, two different companies ended up walking away with pieces of the original Unix. Novell originally bought it all, then decided to keep the Unix source code and sell the Unix trademark — the name, in other words — and the Single Unix Specification standards to the X/Open Company. The Open Group, as it is now called, has since learned to use these assets profitably by offering qualification testing and certification for operating systems. If your OS meets certain requirements, passes the qualification tests, and you pay the fees, you get to call it Unix. Should GNU/Linux get certified?