License. Visda is freely available under the ISC license.  Copyright (c) 2010-2011, Christian Wojner <chrisu@visda.org> Permission to use, copy, modify, and/or distribute this software for any purpose with  or without fee is hereby granted, provided that the above copyright notice and this  permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL  WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED  WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE  AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING  FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.