1Eigen is primarily MPL2 licensed. See COPYING.MPL2 and these links: 2 http://www.mozilla.org/MPL/2.0/ 3 http://www.mozilla.org/MPL/2.0/FAQ.html 4 5Some files contain third-party code under BSD or LGPL licenses, whence the other 6COPYING.* files here. 7 8If you want to guarantee that the Eigen code that you are #including is licensed 9under the MPL2 and possibly more permissive licenses (like BSD), #define this 10preprocessor symbol: 11 EIGEN_MPL2_ONLY 12For example, with most compilers, you could add this to your project CXXFLAGS: 13 -DEIGEN_MPL2_ONLY 14This will cause a compilation error to be generated if you #include any code that is 15LGPL licensed. 16