IGL copyleft subdirectory
Functions in the include/igl/copyleft/ subdirectory are in the
igl::copyleft:: namespace to indicate that they are under a more aggressive
copyleft than
MPL2 used for the main
include/igl directory and igl:: namespace. Most notably, this subdirectory
includes code that is under
GPL.
Typically a company planning on developing software without releasing its source code will avoid or purchase licenses for such dependencies. If you do obtain such a license for the dependencies employed here, you are free to use the libigl functions here as per their MPL2 license.