The question of whether training artificial intelligence models on copyrighted books is legal remains a highly complex and unresolved issue. Currently, there is no straightforward answer, as the intersection of copyright law and machine learning is still rapidly evolving. Proponents argue that analyzing text for training purposes falls under fair use, while authors and publishers strongly contend it infringes on their exclusive rights. Courts and lawmakers are actively debating this matter. Until definitive legislation or judicial rulings are established, the legal landscape surrounding AI training data will remain complicated and subject to ongoing interpretation by legal experts around the world.