> You're right that the Open Source Definition doesn't define the term "open source" - usage does. But common usage of "open source" still means "something that meets the open source definition", not "I can see the source code". There are some people who use a different definition, but it's a long way from being well accepted.

True, it'd be interesting if someone did some sort of study on that though, and get some real numbers. I have the impression that people know less and less what the open source definition even is, so maybe this has started to shift in the last few years? I have a feeling, to younger developers, open source means often (in practice): I can see the code, and I can use it without having to pay...