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The game code is released under the GNU GPL v3.0.
This game makes use of the following open source technologies, which are available under the following licenses. for details see license.txt in the install directory.
pygame,Stockfish Chess, python-chess, stockfish(python wrapper by zhelyabuzhsky)
pygame is available under the LGPL License.
Stockfish, python-chess is available under the GPL V3 License.
stockfish(python wrapper) is available under the MIT License.

a Stockfish binary has been bundled as REMOStockFish.exe.
No modifications have been made to the source code of pygame, Stockfish, python-chess, Pyside2