After doing a bit of research i found a couple of links about whether you are allowed to download YouTube videos or not.
Under frequently asked questions i found the rule that states you are not allowed to download YouTube videos but that doesn’t obviously stop s. http://www.youtube.com/t/faq
YouTube is only designed to allow users to watch and upload videos onto the website but clearly people are determined to add another option that would be download. http://www.computerhope.com/issues/ch001002.htm
Youtube’s Terms of Service