Hi! I just came across http://www.boost.org/more/lib_guide.htm#License where it is stated that any boost library license - Must be simple to read and understand. - Must grant permission to copy, use and modify the software for any use (commercial and non-commercial) for no fee. - Must require that the license appear on all copies of the software source code. - Must not require that the license appear with executables or other binary uses of the library. - Must not require that the source code be available for execution or other binary uses of the library. - May restrict the use of the name and description of the library to the standard version found on the Boost web site. At the same place one can find "Restricted licenses like the GPL and LGPL are not acceptable." I may have overlooked something, but I feel like the LGPL meets the requirements above. Could You please explain or point to further information about this issue. This is not intended as a political discussion (though it might turn to that) I am just trying to find the best free license model for my own yet-to-publish Expression Template Library. Thanks, Markus