User blog comment:TOR/Join us in protecting the freedom of user-generated content/@comment-4129195-20180909124515/@comment-33359237-20180909125919

Check out Google's image search: https://images.google.com/. It allows you to search for occurences of an image (as opposed to searching for a link or text near the image). It would be relatively easy to combine the result of that search with a database of media producers to identify any reuse of their images automatically. It might produce false positives, which could trigger a manual process for clearing the use of an image (similar to what is standard at Wikimedia Commons).