most of the stuff they are claiming isn't even theirs... though they claim that in a contract they own all unix ip and all derivatives... which is where it becomes interesting with stuff that ibm (can't remember the name of the technology) created for their version of unix (infact it was developed a long time ago), sco are basically saying it's theirs.
until sco show the sourcecode (or at least some proof) publicly it's all just a load of crap (same as acacia).
search
www.slashdot.org for a hell of a lot more info about the shitfight.