The fontforge-of-ocaml library is published under the license LGPL v2.1.
About this library, you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, version 2.1.
It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License version 2.1 for more details (enclosed in the file licenses/LGPLv2.1)