Oct 30 (Reuters) – A judge in California federal court on Monday trimmed a lawsuit by visual artists who accuse Stability AI, Midjourney and DeviantArt of misusing their copyrighted work in connection with the companies’ generative artificial intelligence systems.

U.S. District Judge William Orrick dismissed some claims from the proposed class action brought by Sarah Andersen, Kelly McKernan and Karla Ortiz, including all of the allegations against Midjourney and DeviantArt. The judge said the artists could file an amended complaint against the two companies, whose systems utilize Stability’s Stable Diffusion text-to-image technology.

Orrick also dismissed McKernan and Ortiz’s copyright infringement claims entirely. The judge allowed Andersen to continue pursuing her key claim that Stability’s alleged use of her work to train Stable Diffusion infringed her copyrights.

The same allegation is at the heart of other lawsuits brought by artists, authors and other copyright owners against generative AI companies.

“Even Stability recognizes that determination of the truth of these allegations – whether copying in violation of the Copyright Act occurred in the context of training Stable Diffusion or occurs when Stable Diffusion is run – cannot be resolved at this juncture,” Orrick said.

The artists’ attorneys Joseph Saveri and Matthew Butterick said in a statement that their “core claim” survived, and that they were confident that they could address the co