I don't mean you should be technically prevented from performing a translation, edit, or filter on something you own. I mean creators should be able to prevent the publication of a translation whether that is a different language, subtitles, or signing through the usual copyright mechanisms.
I'd never heard this before, but it's really interesting. This reminds me a lot of when Hollywood tried (successfully?) to bully Netflix out of adding a playback speed button. I'm not sure to what extent creators should be allowed to control how people consume their media.
This is the kind of thing why I'm very anti-DRM. Once content hits my system, particularly if I've paid for it, it should be mine to do with as I please.