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I had thought NeXTStep was always BSD based?

Still might have paid the unix license; this was pre AT&T vs USL, but, thought nextstep was basically CMU mach (which itself was BSD+Mach) + the NextStep frameworks/ui

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NeXTSTEP/OpenSTEP were based on 4.3BSD/4.4BSD(not-lite) and required a license from AT&T to distribute. I assume that, to be legally safe, they would have scrapped that code entirely and replaced it with 4.4BSD lite, pulling in code from 4.4BSD lite forks like FreeBSD and NetBSD.

Yes the apis eg cocoa are the openstep apis and the terminal tools under openstep were BSD

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