At GROKLAW there is speculation that this is the start of an attempted defense to the Red Hat suit.
It's certainly an odd move, as only days ago, SCO said "We are in the process of contacting them about coming into compliance and taking a UnixWare license from us. If they refuse to do so, we will sue them directly and see them in court", and apparently claimed to have three groups working on identifying and approaching Linux users, plus were preparing to take a Linux user to court.
As this really does seem like the beginning of an attempted defense to Red Hat's law suit. It would seem like a good idea for the community to collect as many examples of SCO's legal threats as possible - especially to Linux companies and Red Hat in particular - and post them - as well as make Red Hat aware of SCO's latest PR spin, and all the contradictory evidence in their prior actions."