Stockfish sues ChessBase

The Stockfish project, whichdistributes a chess engine under GPLv3, has announcedthe filing of a GPL-enforcement lawsuit against ChessBase, which has been(and evidently still is) distributing proprietary versions of the Stockfishcode.

In the past four months, we, supported by a certified copyright andmedia law attorney in Germany, went through a long process toenforce our license. Even though we had our first successes,leading to a recall of the Fat Fritz 2 DVD and the termination ofthe sales of Houdini 6, we were unable to finalize our dispute outof court. Due to Chessbase's repeated license violations, leadingdevelopers of Stockfish have terminated their GPL license withChessBase permanently. However, ChessBase is ignoring the fact thatthey no longer have the right to distribute Stockfish, modified orunmodified, as part of their products.