This project contains the following libraries from rforge (http://rforge.net/), JRI and REngine. The latter has the subprojects REngineJRI and REngineServe. JRI is available under LGPL 2.1 license whereas REngine is available under GPL 2.1 license:

JRI - Java/R Interface
    Copyright (C) 2004-2007 Simon Urbanek  <simon.urbanek@r-project.org>

    This library 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;
    version 2.1 of the License.

    This library 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.

    You should have received a copy of the GNU Lesser General Public
    License along with this library (LGPL.txt); if not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA  02110-1301  USA

REngine - Java interface to R
Copyright (C) 2004,5,6,7  Simon Urbanek

This library 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.

This library 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.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

