It was other way around. SCO (Santa Cruz Operation) sold off its UNIX business to Caldera, and renamed itself Tarantella (it was sold to Sun some years later). After some business failures Darl McBride took over as CEO in Caldera, renamed Caldera to TSG (The SCO Group) and started these lawsuits.
It's too bad they ended up going that way. We used SCO OpenServer back in the late 90s and early 00s because it was a UNIX that ran on consumer PC equipment. That was a really big deal for installs in rural and remote sites where accessing custom hardware from Sun or SGI or whoever might've been tricky.
It was an interesting time, because seemingly overnight SCO went from being the company that made UNIX for the little guy into the biggest heels on the internet. We migrated most of our customers over to Red Hat and Postgres (from OpenServer/Informix), but still had some SCO sites running when I moved on in 2006ish. I can't imagine anyone moving back now. Linux killed them, and after how they behaved it's hard to shed a tear.
Even though I had long left the SCO world when all the lawsuits happened, but I still felt disappointed that it had come to that.
It is really a shame. Caldera looked like a good distro:
https://distrowatch.com/table.php?distribution=sco
https://virtuallyfun.com/wordpress/2013/03/27/caldera-open-l...