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@Suiseiseki@freesoftwareextremist.com All BSD derivatives can be called proper Unix systems. BSD was based on a VAX port (UNIX/32V) of original Unix V7 source from Bell Labs. Though, its code was put under independent development and later deviated significantly from AT&T. The SunOS itself was also a BSD derivative with proprietary modifications.

Also don't forget that Caldera (aka the "evil" SEO company, which was not the same as the "original" SEO company), as evil as it might have been for making false copyright claims on Linux code, for its credit, did release all AT&T Unix source up to V7 as free software.