There are free implementations of UNIX, but SCO owns the trademark, does that mean that all unix systems are shit?
Dammit, another one who has been listening to and believing SCO's crap instead of researching it.
SCO does
not own the trademark to UNIX. SCO does not "own the Unix operating system" as they like to say.
The UNIX trademark is owned by the Open Group. When Novell got out of the Unix business, they sold the business aspect, OpenServer, and Unixware to the Santa Cruz Operation. If the Santa Cruz Operation licenced System V code, 100% of the royalties were to be paid back to Novell, and Novell would remitt 5% back to Santa Cruz Operation as an administrative fee.
Novell specifically and explicitly retained all copyrights. There has been no transfer of copyright agreement between Novell and Santa Cruz Operation (which is now called Tarantella) and the company which calls itself SCO (the letters of which stand for nothing), which used to be a big linux vendor called Caldera.
Novell turned the specs and trademark over to the Open Group.
There are no "free implementatins of UNIX," except maybe for OpenSolaris (not sure about that one) which doesn't fully exist yet.
Linux is not UNIX. OSX is not UNIX. FreeBSD isn't even UNIX. For something to be UNIX, it must meet the standards of the Open Group. It must be submitted for a lengthy and expensive review process by the Open Group. It does not have to have any code base requirements to do this. There is at least one official UNIX which was written from scratch and has no System V code in it at all.
For some reason, the Open Group has allowed SCO to run around saying they own everything in the world with the only action taken being a couple of letters backed by no lawsuits.