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General information about DWSIM/DTL licensing, external components and their licenses.


DWSIM for Windows, Linux and macOS is licensed under the GNU General Public License v3 (GPLv3).

DWSIM for Android and iOS is free to download and is distributed under a freemium business model, that is, free to download and use, with additional features unlockable through in-app purchases.

DWSIM Thermodynamics Library

DWSIM Standalone Thermodynamics Library (DTL) is licensed under the GNU Lesser General Public License v3 (LGPLv3).

External Components in DWSIM for Windows/Linux

Component Name Component Version Year Copyright Holder Website License License Text
ChemSep Database 6.96 2013 Harry Kooijman, Ross Taylor Perl Artistic License v2
CoolProp 4.2 2014 Ian H. Bell MIT-style License
CSIPOPT 1.0 2012 Anders Gustafsson, Cureos AB Eclipse Public License
CUDAfy 1.25.4963.10126 2013 Hybrid DSP LGPLv2
DockPanel 2.7 2013 DockPanel Project MIT License
DotNumerics 1.0 2009 Jose Antonio De Santiago Castillo GPLv3
FileHelpers 1.6 2007 Marcos Meli LGPLv2
Flee 0.9.14 2009 Eugene Ciloci LGPLv2
Indigo 1.1 2013 GGA Software Services LLC GPLv3
IPOPT 3.9.2 2011 COIN-OR Eclipse Public License
NetOffice 1.6 2011 Sebastian Lange MIT License
Nini 1.1 2010 Brent R. Matzelle MIT License
pyeq2 10.1 2013 James R. Phillips BSDv3
SharpZipLib 2010 IC#Code GPLv2
SyntaxBox 2010 Roger Alsing LGPLv2
ZedGraph 2005 John Champion LGPLv2