[TYPO3-dam] Download file permission

[Roberto Torresani]

Hi!
I'm Roberto from Italy. I'm new in this list.
Some days ago I wrote a similar message in the English list,
but I don't receive a response and so I try to ask here.

I install on my site the last version of DAM.
I need to permit the download of a file only to user of one group.
In the filepage in backed I see there is the field Hide, Start, Stop, Access
but I don't find how I can use it.

I must use a particular module in frontend to do the download of a file
not in a url directory? Now when I upload my file, I insert it in the
fileadmin
directory and this is visible on the net by everybody.

What I missing? Or is not possible to limit access to file download?

Thanks very much
Roberto