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Yes, it is all Unix
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BSD is also unix-like. Quoting OpenBSD, "[OpenBSD] produces a FREE , multi-platform 4.4BSD-based UNIX-like operating system."
The OG Berkeley Software Distribution (BSD) is a direct descendant of Unix. I personally wouldn't qualify this particular version as a "Unix-like".
Yeah, reading these comments, it looks like they are not legally able to call it unix, despite having direct lineage. Linux however is a complete re-write, making it more obviously not proper unix by most definitions.
That's because UNIX is a trademark and OS vendors will have to pay fees to opengroup.org in order to call their OS Unix.