The UNIX System Trademark is the owned by The Open Group. How can SCO claim that they own the UNIX System?
The Open Group owns the UNIX trademark, which means they control the use of the name. However, when SCO transferred the trademark to the Open Group, it was granted rights to continue to use the UNIX name. In any case, SCO owns all rights, title, and ownership to the IP and copyrights, which means they own the actual code that constitutes the UNIX System.