“Legal noob” is definitely one way to say “I am absolutely not a lawyer”.

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.

Probably not, at the very least since Widevine is licensed by Google.