You mean it didn’t already?

Why bother scanning when you can forcibly remove all and any code present in the file?

https://dangerzone.rocks/

Well, this wouldn’t be my main email; it would be just for the site. Thank you so much!

Posteo ftw!

Try running it through Handbrake?

Failing that, it could be worth trying it in Linux. It’s not too hard to spin up a VM, and libdvdcss would have the codecs you need.

Nope! I can use the machine while it does this stuff, and I run updates overnight.

I do also have Flatpak, for when I need software ASAP (as well as when it isn’t in the repos).

I think this might be what you’re looking for: https://github.com/seemoo-lab/AirGuard

It can also cause permanent brain damage

Yeah, that sounds like she clicked an ad. Personally, I’d recommend switching to Startpage, Whoogle, or SearXNG; but I understand that might be easier said than done.