Already mentioned was the need to enter a user and pass to watch videos you download. I have a sponsor using that, it's called "Digital Rights Management".
DRM is a technology to put usage restrictions on video files in order to protect them from online piracy or even more from users who sign up, download everything they can only to cancel again. These videos can only be played back after a valid username and password has been entered by the user. This means that users need to remain active and keep their account in good standing to be able to watch the videos, even if they are on their harddrive.
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