Viverra is free software. As it contains code derived from other code released under the GNU Public License, it is itself available under those terms -- see below.

    Viverra, a web application framework
    Copyright (C) 2006 - 2010 Rami Chowdhury

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License  for more details.