NEW YORK (AP) -- Disney and Universal have filed a copyright lawsuit against popular artificial intelligence image-generator Midjourney on Wednesday, marking the first time major Hollywood companies have enter the legal battle over generative AI.

Filed in federal district court in Los Angeles, the complaint claims Midjourney pirated the libraries of the two Hollywood studios to generate and distribute "endless unauthorized copies" of their famed characters, such as Darth Vader from Star Wars and the Minions from Despicable Me.

"Midjourney is the quintessential copyright free-rider and a bottomless pit of plagiarism. Piracy is piracy, and whether an infringing image or video is made with AI or another technology does not make it any less infringing," the companies state in the complaint.

The studios also claimed the San Francisco-based AI company ignored their requests to stop infringing on their copyrighted works and to take technological measures to halt such image generation.

Midjourney could not immediately be reached for comment. The small startup is one of a crop of research labs enabling people to experiment with AI-generated visuals and text.

Major AI developers don't typically disclose their data sources but have argued that taking troves of publicly accessible online text, images and other media to train their AI systems is protected by the "fair use" doctrine of American copyright law.