O projeto Stockfish, que \u00e9 distribu\u00eddo sob a licen\u00e7a GPLv3, processou a empresa ChessBase, revogando a licen\u00e7a GPL para o uso de seu c\u00f3digo. Stockfish \u00e9 o motor de xadrez mais forte utilizado nos servi\u00e7os de xadrez lichess.org e chess.com. A a\u00e7\u00e3o foi movida devido \u00e0 inclus\u00e3o do c\u00f3digo Stockfish em um produto propriet\u00e1rio sem a abertura dos c\u00f3digos-fonte da obra derivada. <\/p>\n
A empresa ChessBase \u00e9 conhecida por seu programa de xadrez Fritz desde os anos 1990. Em 2019, lan\u00e7ou o motor Fat Fritz, baseado na rede neural do motor open source Leela Chess Zero, que por sua vez foi desenvolvido a partir dos trabalhos do projeto AlphaZero, da Google. Isso n\u00e3o constituiu uma viola\u00e7\u00e3o de qualquer legisla\u00e7\u00e3o, embora os desenvolvedores da Leela estivessem descontentes com o fato de a ChessBase ter posicionado o Fat Fritz como um desenvolvimento independente, sem reconhecer as contribui\u00e7\u00f5es das equipes do AlphaZero e LeelaZero. <\/p>\n
Em 2020, a ChessBase lan\u00e7ou o produto Fat Fritz 2.0, baseado no motor Stockfish 12, que possui sua pr\u00f3pria arquitetura de rede neural NNUE (\u041d\u0435\u0439\u0440\u043e\u043d\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, Eficientemente Atualiz\u00e1veis). A equipe do Stockfish, com a ajuda de advogados, conseguiu retirar o programa Fat Fritz 2.0 das redes de varejo de DVDs na Alemanha, mas, insatisfeita com o resultado, anunciou a revoga\u00e7\u00e3o da licen\u00e7a GPL do Stockfish para a ChessBase e entrou com uma a\u00e7\u00e3o judicial. <\/p>\n
Esta n\u00e3o \u00e9 a primeira temporada de drama em torno do c\u00f3digo do Stockfish, que motores comerciais adotam ignorando a GPL. Por exemplo, anteriormente ocorreu um incidente com a fuga de c\u00f3digos fonte do motor propriet\u00e1rio Houdini 6, que revelou que ele se baseava no c\u00f3digo do Stockfish. O Houdini 5 participou da competi\u00e7\u00e3o TCEC e chegou \u00e0 superfinal da nona temporada, mas acabou perdendo para o Stockfish. Em 2017, a vers\u00e3o seguinte, Houdini 6, conseguiu vencer o Komodo na superfinal da d\u00e9cima temporada do TCEC. Os c\u00f3digos fonte vazados em 2020 revelaram essa desonestidade, infringindo um dos pilares do FOSS \u2014 a GPL. <\/p>\n
Relembramos que a licen\u00e7a GPL prev\u00ea a possibilidade de revoga\u00e7\u00e3o da licen\u00e7a para o infrator e a cessa\u00e7\u00e3o de todos os direitos do licenciado concedidos por esta licen\u00e7a. De acordo com as regras de rescis\u00e3o da GPLv3, se as viola\u00e7\u00f5es foram identificadas pela primeira vez e corrigidas dentro de 30 dias a partir da notifica\u00e7\u00e3o, os direitos da licen\u00e7a s\u00e3o restaurados e a licen\u00e7a n\u00e3o \u00e9 completamente revogada (o contrato permanece n\u00e3o violado). Os direitos tamb\u00e9m s\u00e3o imediatamente restaurados se as viola\u00e7\u00f5es forem corrigidas, caso o titular da licen\u00e7a n\u00e3o tenha notificado sobre a viola\u00e7\u00e3o dentro de 60 dias. Se os prazos expirarem, a viola\u00e7\u00e3o da licen\u00e7a pode ser interpretada como uma viola\u00e7\u00e3o do contrato, pela qual pode-se buscar compensa\u00e7\u00f5es financeiras na justi\u00e7a. \u041f\u0440\u043e\u0435\u043a\u0442 Stockfish, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0439 \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv3, \u043f\u043e\u0434\u0430\u043b \u0432 \u0441\u0443\u0434 \u043d\u0430 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u044e ChessBase, \u043e\u0442\u043e\u0437\u0432\u0430\u0432 \u0443 \u0442\u043e\u0439 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u044e GPL \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430. Stockfish \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 \u0441\u0438\u043b\u044c\u043d\u0435\u0439\u0448\u0438\u0439 \u0438\u0437 \u0448\u0430\u0445\u043c\u0430\u0442\u043d\u044b\u0445 \u0434\u0432\u0438\u0436\u043a\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445\u0441\u044f \u043d\u0430 \u0448\u0430\u0445\u043c\u0430\u0442\u043d\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u0445 lichess.org \u0438 chess.com. \u0418\u0441\u043a \u043f\u043e\u0434\u0430\u043d \u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u043a\u043e\u0434\u0430 Stockfish \u0432 \u043f\u0440\u043e\u043f\u0440\u0438\u0435\u0442\u0430\u0440\u043d\u044b\u0439 \u043f\u0440\u043e\u0434\u0443\u043a\u0442 \u0431\u0435\u0437 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0445 \u0442\u0435\u043a\u0441\u0442\u043e\u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b. \u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f ChessBase, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100802","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47O projeto Stockfish processou a empresa ChessBase e revogou a licen\u00e7a GPL | ProHoster","description":"O projeto Stockfish, distribu\u00eddo sob a licen\u00e7a GPLv3, processou a empresa ChessBase, revogando a 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"