ipacialsection

Going by their Mastodon account, seems they were erroneously detected as "from a US-sanctioned region" and it took too long for said error to be resolved, so they just made the switch.

Handbrake will probably still work if you compile it from source, but it seems like upstream isn't paying much attention to libdvdcss support.

The version in Debian's repo still works for me, anyway.

I've never used these, but I've come across them while scrolling through F-Droid and they seem to fit this use case:

Kotatsu
Kinoko