I've a got a website that covers images, articles, projects, etc about a widget. It also imports videos via RSS from youtube, metacafe, etc. The majority of the videos come from youtube. Now with time, a lot of these videos have become dead (probably due to copyright infringement), but how do I identify these videos ? Youtube still keeps the thumbnail image so I cant use a 404 as an identifier. My site seems unprofessional when a large number of videos appear dead. I need a way to identify dead videos so I can remove them from my database. Suggestions ?