The Santa Cruz Operation was NOT taken over by Caldera
Old SCO sold their trademark, and the OpenServer & UnixWare IP to Caldera. Caldera some time later changed their name to "SCO Group" which they could do as they then owned the trademark. The original SCO company changed their name to "Tarantella", and then years later was taken over by Sun (and we know what's happened to them!)
And good bloody riddance to SCaldera, in my opinion. Old SCO was a good company, and all SCaldera ever did was drag their good name through the mud.