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GPL and other copy-left licenses work in that way. If StockFish was MIT licensed before, then ChessBase can use the latest version with that license. They could
by theturtletalks 5y ago
GPL and other copy-left licenses work in that way. If StockFish was MIT licensed before, then ChessBase can use the latest version with that license. They could even fork the repo at that point and continue developing. If StockFish was always GPL, then the license can be terminated.