> The term has a well-defined meaning provided by the OSI, and they arguably have the right to define what it means and which licenses meet the definition, being the ones who pretty much invented the term.

Funnily enough, many people would argue the exact opposite -- that "open source" has a common meaning that is separate from the "Open Source" which the OSI defines. I don't really have a strong opinion either way.

> "Proprietary" does not suddenly mean "restricts any of the four freedoms" just because you said so.

I am using the term in the same manner as the FSF. Maybe you disagree with their definition, but it's hardly something I've just come up with in this argument -- this definition in the context of software licenses has been in use since the 80s. If you disagree with that definition, complain to the FSF about their subversion of language instead of me.