The Befunge-93 specification is not open-source (yet), but it is freely redistributable unmodified for non-commercial purposes. The contributed Befunge-93 example sources are copyrighted by their respective authors. Except where otherwise noted, they are not open-source works, but their contributors' willingness to allow them to be included in this distribution implies that they are all freely redistributable unmodified for non-commercial purposes. If you wish to base your next best-selling novel on one of them, you should seek out and contact its author for permission first. There is one exception: all Befunge-93 example sources in this distribution which were written by Chris Pressey is in the public domain. The source code for the reference interpreter and supporting tools (in the `src` subdirectory) is covered under the following BSD-style license: Copyright (c)1993-2012, Chris Pressey, Cat's Eye Technologies. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notices, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notices, this list of conditions, and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the names of the copyright holders nor the names of their contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.