That would block youtube-dl, but the user could still customise their browser to record the video stream to disk. This would mean it would take as long to recor

That would block youtube-dl, but the user could still customise their browser to record the video stream to disk. This would mean it would take as long to record as to play the video, but it would work. As Mindwipe says, if Google really meant business they'd use WideVine for all content rather than just for pay-to-access content.