When the CS group was added to EE a few years later, their was history, mechanism, etc. Berkeley had been release source code for a lots of different project. The Berkeley Software Distribution for Unix V6 was just the the drop for UNIX - who knew at the time the life it wold spawn (although I note SPICE is still being used, so even with UNIX's success, SPICE still hold the record for the "longest" used" BSD release code). Anyway, "
dop" used to love to remind the students of that mantra. And he came up with it 20-25 years before Eric Raymond ever wrote his book and started equating "open" with "Stallmanism." ;-)