This release of Jif and the Jif IDE is governed by the GNU Lesser General Public License as described by the following copyright notices.
Jif IDE 0.1.0 Copyright (C) 2014-2016 Jif project group, Cornell University. Jif IDE is free software; 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; either version 2.1 of the License, or (at your option) any later version. Jif IDE 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 for more details. Jif 3.5.0 Copyright (C) 1999-2016 Jif project group, Cornell University. Jif is free software; 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; either version 2.1 of the License, or (at your option) any later version. Jif 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 for more details.
A copy of the GNU Lesser General Public License version 2.1 can be found here.