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Every source I can find says that NTFS is proprietary Microsoft code, but I can still find the specifications for it and open source drivers, like NTFS-3G, made by Tuxera. I can't find any record of Microsoft releasing the specifications, working with Tuxera on NTFS, or trying to fight Tuxera either.

I am confused by this because it contradicts my understand of proprietary standards. Is NTFS-3G a violation of the license for NTFS? And if so, has Microsoft done anything about it?

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    TL;DR: the specs have been reverse-engineered, Microsoft has been less than happy about it, but copyright laws haven't been breached (for complicated legal reasons). And the free drivers still have subtle bugs to this day. – Satō Katsura Sep 19 '17 at 19:13
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    "Yes", and "pure evil". – Bananguin Sep 19 '17 at 19:23
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    I'm voting to close this question as off-topic because this is better suited to a legal SX site. – Jeff Schaller Sep 19 '17 at 22:23
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    @JeffSchaller A question for opensource.stackexchange.com maybe? – xhienne Sep 19 '17 at 22:39

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