
Apple Computer
is being sued by The Open Group, the San Francisco company that claims ownership of the Unix trademark, for using the term Unix in conjunction with its Mac OS X operating system without a license. Apple has countersued, asking a judge to declare that the trademark is invalid, because the term Unix has become generic. This legal battle, though separate from SCO's recent claim that Linux uses copyrighted Unix source code, adds further fire to the debate over the custody of Unix--the 30 plus-year old OS originally developed by AT&T.
but that's not the complete issue. It's not that simple. For example, they refer to OS X as UNIX-based.
http://www.apple.com/macosx/jaguar/unix.html
But you aren't supposed to do that if you are a trademark holder. (See previous link)
But Apple also refers to UNIX applications. What is Apple supposed to do if they intend to describe these Apps? In this case it's clearly generic. Changing the caps doesn't change anything (or they would).