My videos stealed on youtube

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GRRR! I have made a lot of anime music videos about the anime The Slayers and all of them have been put on you tube by complete strangers. I don't mind as long as they say it's not their video, but a [censored] has been capable of EDITING my videos and replace all the credits to my website with credits of himself! Is there a way to make him delete them? The videos have also been ruined coz the credits are part of it (in everyone at the end there's a zoom to an image I've made with the credits) Oh the frustration -____________-