![]() ![]() In case Chessbase will continue distributing products based on Stockfish after one year, their advertisements will have to refer to the use of Stockfish, and comparisons of playing strength with Stockfish or other chess engines shall be truthful and provable (e.g. If the respective licenses require the provision of the source code, Chessbase will enable a download of the source code by anyone from there. Also, they will internally introduce the role of a "Free Software Compliance Officer" and list under the domain the products that contain the software Stockfish under the GPL-3.0 or other Free and Open Source Software (FOSS). In case the terms are breached, Chessbase will have to pay an appropriate amount to the Free Software Foundation Europe e.V.įor the purpose of informing the public, Chessbase will place a clearly visible notice on all of its websites relating to Fat Fritz 2 and/or Houdini 6, containing a text referring to the GPL-3.0 license terms and the settlement. ![]() After one year, Chessbase can exercise the license to the Stockfish software again, under the conditions of the GPL-3.0. The terms of the agreement include that Chessbase refrains from distributing and/or making publicly available the Stockfish software for a period of one year. The two parties involved in the litigation, which appeared before the District Court in Munich, Germany, have agreed that Chessbase, longterm, can continue distributing products as long as the company ensures compliance with the GPL-3.0 license terms and adequately informs the public about the use of the Stockfish software in its products. The agreement between Chessbase and Stockfish was announced on the Stockfish website on Saturday and confirmed as accurate to by Matthias Wullenweber, owner and chief programmer of Chessbase. 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.The German chess software company ChessBase and the team behind the open-source chess engine Stockfish have reached a settlement and ended their legal dispute over the latter's claim regarding a repeated license violation by Chessbase with their 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. The dispute stems from the way ChessBase used Stockfish’s GPL v3-licensed code in two products: Fat Fritz 2 and Houdini 6. 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. ![]() 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. 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. In this blog, Heather addresses two specific questions that could surface during the proceedings. Question 1: GPL and Neural Network Weights Your email address is added to our subscription list. Stockfish is distributed under GPL v3, which is a strong copyleft open source software license.
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