It says above that you are the founder so I saw it only logical to come to you with a problem I am dealing with.
First I want to apologize for using anon. I do not have an account. I am simply Kitistrasza and you can contact me at kitistrasza.devianart.com if needed.
One of your users thats goes by, Silver Lining/ Winterheart has been stealing and using my art / OCs. He even left my water marks on the pieces ALONG with my name on the bottom of the hooves. I assume you do not tolerate theft so I would ask if you can have the pieces removed. I would highly respect it since this is the second time it has happened.
Oh, hello! I am terribly sorry for the stolen art. Their character is a timelord (i think you can guess) and that was their regeneration. I will notify them later, and be removing it! I'm sure they meant no harm at all! They also never took credit for it, as well. I will be removing it right now though.
I didn't think they were claiming the art for themselves but they were claiming the OCs. Which rightfully belong to me. So I just wanted it taken down since that's not okay. I also recommend checking the sources on the other two pictures. They look familiar to me as well but I didn't touch them since they weren't mine.