>decrypting things like 4K Netflix content, among other things, generally requires you to have something like a Widevine L1 CDM from one of the Netflix-approved devices, which typically sits in those hardware trusted execution environments, so you need an active valuable exploit or insider leaks from someone at one of the manufacturers.

Or just use a cheap Chinese HDMI splitter that strips HDCP 2.2 and record the 4K video with a simple HDMI capture device.

But if you are talking about preserving media or making media accessible, then it's not like we NEED 4K.