A legal dispute involving Meta and a group of bestselling authors has intensified over the use of copyrighted works for training artificial intelligence models. The authors allege that Meta downloaded databases containing millions of pirated books to train its large language models without obtaining proper licenses. This conflict has attracted support from publishers and law professors, who warn of potential adverse effects on both AI development and copyright owners' rights. Meanwhile, a related case between Thomson Reuters and ROSS Intelligence resulted in a ruling favoring the creators, emphasizing the competitive harm caused by using copyrighted material without compensation. ROSS Intelligence has petitioned the Third Circuit Court of Appeals for an interlocutory appeal on key issues, including the copyrightability of Westlaw headnotes and the fair use defense, seeking clarity on what constitutes fair use in AI training. The court's forthcoming decisions are expected to set important precedents for the AI community and the use of copyrighted content in AI development.