That's not how what you wrote read. You may have meant that a BSD license existed in '82, but you implied the BSD modified Unix operating system was generally

That's not how what you wrote read. You may have meant that a BSD license existed in '82, but you implied the BSD modified Unix operating system was generally open source long before it really was. The fact that many manufactures secured separate licenses (for which they paid Berkeley a lot of money) is irrelevant. The simple fact is that the truly "free" BSDs did not exist before the early 90s and the resolution of the dispute between AT&T and Berkeley. Full stop. End of story.