If I'm remembering correctly then they also do something to the file itself to make it hard to get into. One time I used a browser-plugin (which looked for video files on the page you're currently on) to download something I rented from YouTube, and it downloaded a big 500mb mp4 file that none of my media players could read.
Yea. I also did see some Scare Pewdiepie episodes, ones that are paid content on Youtube, on Zippcast before the site shut down. So, if certain Zippcasters can get videos from Youtube with a paywall onto Zippcast, then there MUST be a way to download the Webdriver torso video