AT&T had partnered with Novell in the late 80s to promote System V as Unix System Labs (I remember visiting the Summit NJ offices while I was at BTL myself). Early 90s they sold off their share completely to Novell (prompting Dennis Ritchie's quoting Genesis and Esau selling his birthright for pottage). Novell took over the various OEM licenses to IBM, DEC, etc, but eventually outsourced the royalty collection business to Santa Cruz Operation as part of their licensing to produce UNIX on Intel CPUs. They very clearly kept the copyrights (such as they were - see Groklaw getting the AT&T v. BSD settlement unsealed), which was the basis for the Novell lawsuit after Caldera bought out the old SCO and claimed All The Rights while suing IBM for beeelyuns of dollars.
Novell has since been bought by Attachmate, who now nominally owns the source rights. The UNIX trademark was donated to The Open Group by Novell early 90s.
They are relatively good but absolutely terrible. -- Alan Kay, commenting on Apollos