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QuantLib includes code taken from Peter Jäckel's book "Monte Carlo Methods in Finance".
QuantLib includes software developed by the University of Chicago, as Operator of Argonne National Laboratory.
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 notice,
this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice,
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 the QuantLib
Group and its 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.
QuantLib is Non-Copylefted Free Software [1] released under the modified BSD License [2] (also know as XFree86-style license).
QuantLib is Open Source [3] because of its license: it is OSI Certified Open Source Software [4]. OSI Certified is a certification mark of the Open Source Initiative [5].
The modified BSD License is GPL compatible as confirmed by the Free Software Foundation [6].
This license has been adopted to allow free use of QuantLib and its source, to make QuantLib flourish as a free-software/open-source project. It allows proprietary extensions to be commercialized.
[1] http://www.gnu.org/philosophy/categories.html#Non-CopyleftedFreeSoftware
[2] http://www.opensource.org/licenses/bsd-license.html
[3] http://www.opensource.org/docs/definition.html
[4] http://www.opensource.org/docs/certification_mark.html
[5] http://www.opensource.org
[6] http://www.gnu.org/philosophy/bsd.html