If someone adds a video to a webpage using the video tag you can find its link in the source code of the webpage very easily and download it. But websites like netflix, lynda, hulo, youtube, vimeo, dailymotion etc somehow manage to prevent you from being able to do it. How do they do it? How can I do it? I tried googling but didn't find anything useful. Can anyone help?
P.S I would like a client-side solution so if possible no php, perl, ruby etc