Public record, but restricted file?

Hi - Is there a way to have item records publicly viewable, but then only Researchers would be able to download the associated file attached to the item?

I want my records (metadata) be be public, but only authorized people could actually download the attached document.

(I checked a few years ago, but was hoping maybe there has been a plugin or change that might allow this?)

This sounds like it quite similar to the work on an Embargo plugin discussed at this thread

So, doesn't quite exist yet, but others are working on things quite similar.