Thanks for contacting me The changes were made according to Wikipedia s policy on copyright issues The specific concerns with this edit were the YouTube videos used as references Directing others to a site that violates copyright has been considered a form of contributory infringement in the United States Linking to a page that illegally distributes someone else s work sheds a bad light on Wikipedia and its editors Here is a link for more information on links which should be avoided Please don t hesitate to contact me if you ever have any other questions Best regards amuse