You have to understand that The SCO Group is not the old, little SCO company. The SCO group is run and owned by one of the biggest money pools outside of Redmond. They bought SCO and all its properties and are now trying to turn their small investment into huge returns by suing everyone.
SCO doesn't seem to remember their history. IBM went after the clone makers years ago for copyright infringement and got their asses handed to them. They now have the biggest, most skilled, legal team on the planet and they know every single letter of copyright, trademark and patent law on the planet. Backwards and forwards. They keep them in the basement and feed them raw meat--but only occasionally. If SCO pushes this hard enough, and forces the issue into court (not all this pre trial manuevering), they're lawyers are going to get eaten alive, and IBM will own SCO outright.