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

In the past four months, we, supported by a certified copyright and media law attorney in Germany, went through a long process to enforce our license. Even though we had our first successes, leading to a recall of the Fat Fritz 2 DVD and the termination of the sales of Houdini 6, we were unable to finalize our dispute out of court. Due to Chessbase’s repeated license violations, leading developers of Stockfish have terminated their GPL license with ChessBase permanently. However, ChessBase is ignoring the fact that they no longer have the right to distribute Stockfish, modified or unmodified, as part of their products.