Twelve copyright lawsuits filed against OpenAI and Microsoft have been merged into a single case in the Southern District of New York.

The US judicial panel on multidistrict litigation decided to consolidate, despite objections from many plaintiffs who argued their cases were too distinct.

The lawsuits claim that OpenAI and Microsoft used copyrighted books and journalistic works without consent to train AI tools like ChatGPT and Copilot.

The plaintiffs include high-profile authors-Ta-Nehisi Coates, Sarah Silverman, Junot Diaz-and major media outlets such as The New York Times and Daily News.

The panel justified the centralisation by citing shared factual questions and the benefits of unified pretrial proceedings, including streamlined discovery and avoidance of conflicting rulings.

OpenAI has defended its use of publicly available data under the legal doctrine of 'fair use.'

A spokesperson stated the company welcomed the consolidation and looked forward to proving that its practices are lawful and support innovation. Microsoft has not yet issued a comment on the ruling.

The authors' attorney, Steven Lieberman, countered that this is about large-scale theft. He emphasised that both Microsoft and OpenAI have, in their view, infringed on millions of protected works.

Some of the same authors are also suing Meta, alleging the company trained its models using books from the shadow library LibGen, which houses over 7.5 million titles.

Simultaneously, Meta faced backlash in the UK, where authors protested outside the company's London office. The demonstration focused on Meta's alleged use of pirated literature in its AI training datasets.

The Society of Authors has called the actions illegal and harmful to writers' livelihoods.

Amazon also entered the copyright discussion this week, confirming its new Kindle 'Recaps' feature uses generative AI to summarise book plots.

While Amazon claims accuracy, concerns have emerged online about the reliability of AI-generated summaries.

In the UK, lawmakers are also reconsidering copyright exemptions for AI companies, facing growing pressure from creative industry advocates.

The debate over how AI models access and use copyrighted material is intensifying, and the decisions made in courtrooms and parliaments could radically change the digital publishing landscape.