[kerng]

Exactly. For instance Windows source code has been "open source" for about 18 years or so via a license anyone can request. This is still not what most people think of when speaking about open source though.

Edit: They call it Shared Source actually: https://www.microsoft.com/en-us/sharedsource/default.aspx

[the_af]

Yes, Shared Source, not open source. Microsoft (un)surprisingly understood the differences, back in the day, and avoided the latter term.

[solarkraft]

Woah, what? The current version?