They would have to prove that Youtube's lack of a download feature is a "technological protection measure" against copyright infringement. A lack of a feature

They would have to prove that Youtube's lack of a download feature is a "technological protection measure" against copyright infringement. A lack of a feature can be rationalized in any direction. Ultimately not enabling you to download increases youtube's revenues because of people rewatching the same videos online. Unless Youtube states explicitly that this lack of a download feature is for the purpose of copyright infringement then they can pipe it and stop disrupting everyone outside the US.