I was browsing an art repository when I came across art I recognized as being sold via the Roll20 Marketplace. So I need to know, to whom do I tell this? The artist so s/he can privately yell at the repository maintainer? The Roll20 team, so they can shake a legal fist at the maintainer, and check for other stolen artwork? Both? Neither, and it's someone else I should alert? I'm very annoyed at this repository -- gathering free artwork floating around the net is one thing, but posting non-free stuff is quite another. And no, I'm not sharing the URL.