Disney and Universal just sued Midjourney for scraping their IP—ushering in a major showdown over how AI is trained.

Disney and Universal are the first major Hollywood studios to file copyright infringement lawsuits against AI companies, marking a pivotal moment in the ongoing fight by artists, newspapers and content makers to stop AI firms from using their work as training data.

Disney and Universal sued popular artificial intelligence image-generator Midjourney on Wednesday, marking the first time major Hollywood companies have taken legal action against a maker of generative AI technology that could upend the entertainment industry.