First of all, I must say your extension is very, very impressive :-)
Still, I have a precise question about security of Documents which are not "public" but for "registered" or others.
Let's take an example from your demo site.
When I hover the Download link, I see the "real" link to the document.
Example : http://www.demo-joomunited.com/files/91/Root%20category/38/Document.docx
It means I could send it directly to a third party.
For a Public document, no problem of course.
But how does DropFile manages Ddocuments which are for example restricted to "registered" users ?
Could a registered user just "share the direct link" (or is the link "cloaked" so that it requires to be logged in to be able to download the file).
This is of course important as security.
Txs a lot in advance,