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Many of libraries, that have LGPL or permissive licenses, depends on FreeType, that have multi-licensing (FTL/GPL). My question is: if FreeType can be used under any of these licenses, can someone juridically oblige to open the source code of the proprietary product, that distributed in binary form, using the "permissive" dependency, that uses FreeType?

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Is it safe to use FreeType inside a proprietary closed-source software?

Yes.

if FreeType can be used under any of these licenses, can someone juridically oblige to open the source code of the proprietary product, that distributed in binary form, using the "permissive" dependency, that uses FreeType?

The short answer is no. The thing about the FreeType license is that you are required to make an explicit choice among the licensing options. Document the choice you made and you should be good.

  • I suppose, you're right, but I will, as far as possible, switch my projects to stb_truetype.h just to be on the safe side. – Gosha U. Mar 3 '17 at 10:42

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