If I'm reading the terms correctly they are CC0 1.0 Universal Public Domain Dedication by default: https://stability.ai/stablediffusion-terms-of-service#:~:tex

If I'm reading the terms correctly they are CC0 1.0 Universal Public Domain Dedication by default: https://stability.ai/stablediffusion-terms-of-service#:~:text=accepted%20the%20full-,CC0%201.0%20Universal%20Public%20Domain%20Dedication,-(available%20at%20https https://stability.ai/stablediffusion-terms-of-service#:~:tex... Obviously this could change in the future.