QuantLib License

    QuantLib is
        Copyright (C) 2000, 2001, 2002, 2003 RiskMap srl

        Copyright (C) 2001, 2002, 2003 Nicolas Di Césaré
        Copyright (C) 2001, 2002, 2003 Sadruddin Rejeb

        Copyright (C) 2002, 2003, 2004 Decillion Pty(Ltd)
        Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2014, 2015 Ferdinando Ametrano

        Copyright (C) 2003 Kawanishi Tomoya
        Copyright (C) 2003 Niels Elken Sønderby
        Copyright (C) 2003, 2004 Roman Gitlin
        Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2014, 2015, 2016, 2017, 2018, 2019, 2020 StatPro Italia srl
        Copyright (C) 2003, 2004, 2007 Neil Firth

        Copyright (C) 2004 FIMAT Group
        Copyright (C) 2004 Gianni Piolanti
        Copyright (C) 2004 Jeff Yu
        Copyright (C) 2004 M-Dimension Consulting Inc.
        Copyright (C) 2004 Mike Parker
        Copyright (C) 2004 Walter Penschke
        Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Klaus Spanderen

        Copyright (C) 2005 Charles Whitmore
        Copyright (C) 2005 Sercan Atalik
        Copyright (C) 2005, 2006 Theo Boafo
        Copyright (C) 2005, 2006, 2007 Joseph Wang
        Copyright (C) 2005, 2006, 2007, 2009 Piter Dias
        Copyright (C) 2005, 2006, 2008 Toyin Akin
        Copyright (C) 2005, 2013 Gary Kennedy

        Copyright (C) 2006 Richard Gould
        Copyright (C) 2006 Silvia Frasson
        Copyright (C) 2006 Warren Chou
        Copyright (C) 2006 Yiping Chen
        Copyright (C) 2006, 2007 Banca Profilo S.p.A.
        Copyright (C) 2006, 2007 Chiara Fornarola
        Copyright (C) 2006, 2007 Cristina Duminuco
        Copyright (C) 2006, 2007 François du Vignaud
        Copyright (C) 2006, 2007 Giorgio Facchinetti
        Copyright (C) 2006, 2007 Katiuscia Manzoni
        Copyright (C) 2006, 2007 Marco Bianchetti
        Copyright (C) 2006, 2007 Mario Pucci
        Copyright (C) 2006, 2007, 2008 Allen Kuo
        Copyright (C) 2006, 2007, 2008, 2009, 2010 Mark Joshi
        Copyright (C) 2006, 2007, 2008, 2009, 2012 Roland Lichters

        Copyright (C) 2007 Affine Group Limited
        Copyright (C) 2007 Gang Liang
        Copyright (C) 2007 Richard Gomes
        Copyright (C) 2007, 2008 Laurent Hoffmann
        Copyright (C) 2007, 2008, 2009, 2010, 2011 Chris Kenyon

        Copyright (C) 2008 Florent Grenier
        Copyright (C) 2008 Francesca Mariani
        Copyright (C) 2008 Francesco Zirilli
        Copyright (C) 2008 Frank Hövermann
        Copyright (C) 2008 J. Erik Radmall
        Copyright (C) 2008 John Maiden
        Copyright (C) 2008 Lorella Fatone
        Copyright (C) 2008 Marek Glowacki
        Copyright (C) 2008 Maria Cristina Recchioni
        Copyright (C) 2008 Paul Farrington
        Copyright (C) 2008 Piero Del Boca
        Copyright (C) 2008 Roland Stamm
        Copyright (C) 2008 Simon Ibbotson
        Copyright (C) 2008 Yee Man Chan
        Copyright (C) 2008, 2009 Andrea Odetti
        Copyright (C) 2008, 2009 Andreas Gaida
        Copyright (C) 2008, 2009, 2010, 2011, 2012, 2014 Master IMAFA - Polytech'Nice Sophia - Université de Nice Sophia Antipolis
        Copyright (C) 2008, 2009, 2012, 2014 Ralph Schreyer
        Copyright (C) 2008, 2009, 2014, 2015, 2016 Jose Aparicio
        Copyright (C) 2008, 2011 Charles Chongseok Hyun

        Copyright (C) 2009 Bernd Engelmann
        Copyright (C) 2009 Bojan Nikolic
        Copyright (C) 2009 Dirk Eddelbuettel
        Copyright (C) 2009 Frédéric Degraeve
        Copyright (C) 2009 Nathan Abbott
        Copyright (C) 2009 Sun Xiuxin
        Copyright (C) 2009 Sylvain Bertrand
        Copyright (C) 2009, 2010 Dimitri Reiswich
        Copyright (C) 2009, 2010, 2012 Liquidnet Holdings, Inc.

        Copyright (C) 2010 Adrian O' Neill
        Copyright (C) 2010 Alessandro Roveda
        Copyright (C) 2010 DeriveXperts SAS
        Copyright (C) 2010 Hachemi Benyahia
        Copyright (C) 2010 Kakhkhor Abdijalilov
        Copyright (C) 2010 Manas Bhatt
        Copyright (C) 2010 Michael Heckl
        Copyright (C) 2010 Robert Philipp
        Copyright (C) 2010 Slava Mazur
        Copyright (C) 2010 SunTrust Bank
        Copyright (C) 2010, 2011, 2012, 2013 Andre Miemiec
        Copyright (C) 2010, 2014 Cavit Hafizoglu

        Copyright (C) 2011, 2013, 2014 Fabien Le Floc'h

        Copyright (C) 2012 Mateusz Kapturski
        Copyright (C) 2012 Samuel Tebege
        Copyright (C) 2012 Simon Shakeshaft
        Copyright (C) 2012 Édouard Tallent
        Copyright (C) 2012, 2013 Grzegorz Andruszkiewicz
        Copyright (C) 2012, 2013, 2014, 2015, 2016, 2017, 2018 Peter Caspers

        Copyright (C) 2013 BGC Partners L.P.
        Copyright (C) 2013 Chris Higgs
        Copyright (C) 2013 Yue Tian
        Copyright (C) 2013, 2014, 2015 Cheng Li

        Copyright (C) 2014 Michal Kaut
        Copyright (C) 2014, 2015 Bernd Lewerenz
        Copyright (C) 2014, 2015 Johannes Göttker-Schnetmann
        Copyright (C) 2014, 2015 Thema Consulting SA
        Copyright (C) 2014, 2015, 2016 Michael von den Driesch
        Copyright (C) 2014, 2015, 2016 Paolo Mazzocchi
        Copyright (C) 2014, 2017 Francois Botha

        Copyright (C) 2015 CompatibL
        Copyright (C) 2015 Dmitri Nesteruk
        Copyright (C) 2015 Maddalena Zanzi
        Copyright (C) 2015 Riccardo Barone
        Copyright (C) 2015, 2016 Andres Hernandez

        Copyright (C) 2016 Nicholas Bertocchi
        Copyright (C) 2016 Stefano Fondi
        Copyright (C) 2016, 2017 Fabrice Lecuyer
        Copyright (C) 2016, 2019 Eisuke Tani

        Copyright (C) 2017 BN Algorithms Ltd
        Copyright (C) 2017 Joseph Jeisman
        Copyright (C) 2017 Oleg Kulkov
        Copyright (C) 2017 Paul Giltinan
        Copyright (C) 2017 Werner Kuerzinger

        Copyright (C) 2018 Alexey Indiryakov
        Copyright (C) 2018 Jose Garcia
        Copyright (C) 2018 Matthias Groncki
        Copyright (C) 2018 Matthias Lungwitz
        Copyright (C) 2018 Roy Zywina
        Copyright (C) 2018 Sebastian Schlenkrich
        Copyright (C) 2018 Tom Anderson

        Copyright (C) 2019 Aprexo Limited
        Copyright (C) 2019 SoftSolutions! S.r.l.
        Copyright (C) 2019 Wojciech Ślusarski

        Copyright (C) 2020 Kline s.r.l.
        Copyright (C) 2020 Leonardo Arcari
        Copyright (C) 2020 Lew Wei Hao
        Copyright (C) 2020 Marcin Rybacki
        Copyright (C) 2020 Piotr Siejda

    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.

    QuantLib includes a set of numbers provided by Stephen Joe and Frances
    Kuo under a BSD-style license.

    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.

# Comments on Copyright and License

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