Its not just Foss people, its common knowledge among technical people.
I've heard the term "published source" used when trying hard not to step in this particular pile.
> Linux is “open source” software meaning, simply, that anyone can get copies of its source code files.
And the state of Kansas:
> Make use of open-source software (OSS). OSS is software for which the source code is freely and publicly available, though the specific licensing agreements vary as to what one is allowed to do with that code.
For me, the reason for the confusion comes from (1) the ambiguous use of the word "open" (visible) vs "closed" (hidden) and (2) the fact that I've personally never seen until now a project that was "source available" but not open to modify under some license, so I haven't had to deal with the distinction.
(And since I'm a little insulted by your incredulity that a technical person could believe that to be true, FWIW, it's common knowledge among English speakers when to use "its" and "it's".)
> However, the obvious meaning for the expression “open source software”—and the one most people seem to think it means—is “You can look at the source code.”
http://www.gnu.org/philosophy/open-source-misses-the-point.h...