Does anyone know if the history of closed/unavailable
vs.
open/available source is documented anywhere? Ideally in a book or
journal that can be properly referenced.
I don't know, but it's not quite as simple as closed/unavailable vs
open/available.
For example, back in the '80s I was at a research lab in academia that
ran VMS. We had the VMS source on microfiche, and indeed I used it to
write patches for command-line editing (this was before DCL grew
command-line editing of its own) - indeed, my patches grew big enough
to break PATCH; I had to split my patch into two patches. But I would
never say the source was "open", especially given what that generally
means today.
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