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form a branch of the family of Unix-like operating systems
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This says to me that it is not in fact Unix but a unix like OS much like Linux.
Operating system - Wikipedia, the free encyclopedia
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The UNIX-like family is a diverse group of operating systems, with several major sub-categories including System V, BSD, and GNU/Linux. The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions. "UNIX-like" is commonly used to refer to the large set of operating systems which resemble the original UNIX.
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Unix like resembles but is not Unix.
Unix-like - Wikipedia, the free encyclopedia
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A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.
There is no standard for defining the term, and some difference of opinion is possible as to the degree to which a given OS is "Unix-like".
The term can include free and open source operating systems inspired by Bell Labs' Unix or designed to emulate its features, commercial and proprietary work-alikes, and even versions based on the licensed UNIX source code (which may be sufficiently "Unix-like" to pass certification and bear the "UNIX" trademark).
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So any OS that sufficiently behaves like Unix can be labeled Unix-like but technically is still not Unix.
BSD, Linux, Minix etc all behave much like Unix and are there for labeled Unix-like but are not Unix.
Back to Windows, you may well be correct on this one, I am still looking for the answer, but I have not found anything to support my friends statement and that lack of documentation would lean toward your being correct.
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You are also confused about the "BSD" license. It is not the same as GPL.
Like I said earlier, BSD license means you can use the source code without contributng back. You can fork BSD and not give anything back
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Ok you got me here, I did have them confused. I was under the impression that since they were both (BSD and Linux) OpenSource they both were GPLed, but as you said, BSD is not GPLed but has it's own license.
The only thing I have been able to find on BSD in windows is that some BSD code was used in the TCP/IP stack, but may or may not still be there.
So it sounds like something was used but that the Windows kernel is not based on BSD. So you are correct again.
However, from what I have read, BSD is not Unix, but is included in a list of Unix-like OSes.