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Re:We've filed a lawsuit against GitHub Copilot by xigoi on Thursday November 03, 2022 @06:56PM (#33459113)
That's not the meaning of proprietary, but otherwise you're right.
Re:We've filed a lawsuit against GitHub Copilot by thomastjeffery on Thursday November 03, 2022 @07:17PM (#33459304)
The definition gets a bit blurry around software, just like the definition of "ownership" does.

Colloquially, "proprietary software" means closed-source. You can definitely put it in context where it means "copyright without license"; but outside that context, the colloquial meaning is enough.