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RUNNING STOCKFISH CHESS SOFTWARE
Stockfish is distributed under GPL v3, which is a strong copyleft open source software license. Question 1: GPL and Neural Network Weights Your email address is added to our subscription list. In this blog, Heather addresses two specific questions that could surface during the proceedings. To help contextualize and analyze the lawsuit, we reached out to Heather Meeker, one of the world’s foremost legal experts on open source software licensing and compliance.
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Stockfish’s litigation, which will reportedly be heard in a German court, seeks to prevent ChessBase from distributing “Stockfish, modified or unmodified, as part of their products.” However, while ChessBase no longer sells Houdini 6, it has continued to sell a version of Fat Fritz 2. There’s consensus that Fat Fitz 2 and Houdini 6 are derivative works of Stockfish’s GPL 3-licensed code - but Stockfishes alleges ChessBase did not comply with the requirements that apply to derivative works.Īs a result of these alleged numerous license violations, Stockfish decided to terminate its license with ChessBase. The dispute stems from the way ChessBase used Stockfish’s GPL v3-licensed code in two products: Fat Fritz 2 and Houdini 6. ChessBase is a company that sells a variety of chess products, including software programs, databases, training, and a magazine. In a case that could be an interesting test of the GPL v3 license, open source chess engine Stockfish recently announced a lawsuit against ChessBase.