The thing is he isn't circumventing copyright protection. He is just allowing it to play in his browser too, no downloading etc. I'm a legal noob, but there always was that "fair interests" like making stuff work on different devices/OSs (youtube-dl is hiding behind this a bit), would it not apply here?
The ambiguity here is why I said potentially. Does circumventing a technical measure mean to access the content without Widevine, or is using Widevine in an unintended way enough? However, the law quite clearly says that fair use doesn't matter; you can't break DRM even if you're not violating copyright.
