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A comment on Using D to Create the World’s Fastest File System. Parent comment

Re:Using D to Create the World’s Fastest File System by ryan_lane on Wednesday December 05, 2018 @03:29PM (#18612196)
Source code being visible doesn't make it open source. It had a personal-use-only license, which isn't a valid OSSI license (which is what makes something open source).
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Re:Using D to Create the World’s Fastest File System by jordigh on Wednesday December 05, 2018 @04:30PM (#18612785)
That's why I qualified it with "if that's what you mean by closed source". I don't know if all source is either open or closed and anything that isn't OSI-approved is closed. I don't think that's what people usually mean by "closed source".

I also freely granted that dmd's ad-hoc license wasn't open source despite having visible source.

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