AFAIK, It's not questionable, there is no gray area. On the US it's a crime, almost everywhere else it's perfectly legal.
(I feel there’s still an opportunity to challenge DMCA 1201 in the US, and then there’s also the triennial review. It’s harder in places where the exemptions are hard-coded — but maybe you know of one that includes an exemption for this kind of DRM removal?).
It looks like there's no way to watch DVDs legally with FOSS (still) in the US?
On the other hand the precedent for ebooks seem a bit better?
It was very frustrating, from a civics perspective, to have to choose between obeying democratically enacted laws or being a chump.