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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 "