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August 25, 2020

A freak historical accident. AT&T Labs, where it was developed, was forbidden under its anti-trust settlement from commercializing products unrelated to its core telecom business. Hence, Unix was licensed very cheaply to universities, including UC Berkeley, which subsequently built one of the more influential branches of the Unix family tree—BSD. Apparently, AT&T classified Unix as industrial waste for tax purposes when licensing it! — How Unix Won