I know the most about stable diffusion. Stable diffusion (based) models are typically open source, you can download them for free, and they easily fit on a che

I know the most about stable diffusion. Stable diffusion (based) models are typically open source, you can download them for free, and they easily fit on a cheap USB stick. They're not actually supposed to have anyone else's pictures in them as such [1]. As far as I can tell, the training is more along the lines of "this is what a dog looks like", "this is what a cat looks like", "this is what a stick looks like" ... etc. At this point in time, unaltered output is automatically public domain, because it is not made by a human. [1] some early bugs notwithstanding.