I would like that if a video exists in a personal library, but is linked to a course, that the person that owns it CAN NOT delete it or unlink from the course. There are those that want to clean up their library but forget they have it linked, or if someone leaves the university and wants to delete all of their videos. If the videos are still being used in a course, they should not be able to delete them. I have been making copies, but I really don't like doing that.