From the instructions "Note: Ensure you are signed in before following these steps." You are just able to download the video/ You'll at that point likely watch it once and then not watch it again.
But sometimes when your traveling and you don't have internet and you want to watch something, this is useful. I mean if you got the video files through someother DRM free site, you wouldn't have these restrictions at all and you wouldn't be paying at all. Then you could argue you are consuming without compensating the creators, which I think wouldn't be right.