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@@ -2,6 +2,45 @@ Libigl is primarily licensed under MPL2
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- http://www.mozilla.org/MPL/2.0/
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- http://www.mozilla.org/MPL/2.0/FAQ.html
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-Some files contain third-party code under other licenses:
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+All `.h` and `.cpp` _files_ directly in `include/igl` (but not necessarily in
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+sub-directories) are subject only to the terms of the MPL2; they should not
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+include any code that is covered by other/less-permissive licenses.
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- - tga.h/tga.cpp GNU GPL
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+The `.h` and `.cpp` _files_ in sub-directories of `include/igl` allow libigl to
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+integrate with external third-party libraries (e.g., those in `external/`) and
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+are subject to the MPL2, _**and**_ also the terms of licenses of the
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+corresponding external library. The licenses used by these libraries fall under
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+three categories:
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+
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+- common "free, non-copyleft licenses" (such as zlib, BSD, MIT, and public
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+ domain)
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+ - `include/igl/anttweakbar`
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+ - `include/igl/embree`
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+ - `include/igl/opengl`
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+ - `include/igl/opengl/glfw`
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+ - `include/igl/opengl2`
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+ - `include/igl/png`
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+ - `include/igl/viewer`
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+ - `include/igl/xml`
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+- common "copyleft" licences (such as GPL, LGPL, and AGPL)
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+ - `include/igl/copyleft`
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+ - `include/igl/copyleft/cgal`
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+ - `include/igl/copyleft/comiso`
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+ - `include/igl/copyleft/cork`
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+ - `include/igl/copyleft/tetgen`
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+- other "uncommon" licenses or commercial software
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+ - `include/igl/lim`
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+ - `include/igl/matlab`
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+ - `include/igl/mosek`
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+ - `include/igl/triangle`
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+
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+The Libigl code that interfaces with "copyleft" libraries is in
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+`include/igl/copyleft`. Only include these headers if you are accept the
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+licensing terms of the corresponding external library. For example, using
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+`include/igl/copyleft/tetgen` requires that you accept the terms of the AGPLv3.
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+
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+One additional exception is include/igl/opengl2/tga.hpp (and tga.cpp), which is
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+subject to the terms of the GNU GPLv2. No other files include these files, so
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+it is safe to use all other files in include/igl/opengl2, even if you do not
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+accept the terms of the GPLv2.
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+// TODO: consider moving these two files to include/igl/copyleft/opengl2
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Alec Jacobson