If you browse LAION (e.g. using this [0]), which SD uses you find all sorts of owned IP there (shutterstock, artstation, fanart from deviantart and tumblr etc.) - because it's a research data set. LAION has a disclaimer that it does not claim ownership and that any troubles you run into by using the graph are your own.
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And in "paintings" I generate with SD I often see a squiggle in the corner that is presumably the result of a signature in the training set.
If you browse LAION (e.g. using this [0]), which SD uses you find all sorts of owned IP there (shutterstock, artstation, fanart from deviantart and tumblr etc.) - because it's a research data set. LAION has a disclaimer that it does not claim ownership and that any troubles you run into by using the graph are your own.
[0] https://rom1504.github.io/clip-retrieval