An executive at one of generative AI’s leading companies has quit over the startup’s controversial use of copyrighted content.

Ed Newton-Rex had been VP of audio at Stability AI, which produces the popular image-generator Stability Diffusion, but resigned due to the firm’s treatment of creators.

“I’ve resigned from my role leading the Audio team at Stability AI, because I don’t agree with the company’s opinion that training generative AI models on copyrighted works is ‘fair use’,” Newton-Rex announced Wednesday on X.