What I was trying to say is that you protect the qvd in windows with NTFS permissions.
See part of document from http://robwunderlich.com/ when talk about qvd.
Q: I am running SBE Server so documents are reloaded right from
the Documents folder. What is your recommendation for location
of the QVD generator documents? In other words, doyou place
them in the Documents folder alongside your production QVW’s?
I recommend putting the QVD generators in a separate "Loaders"
folder. Make this a mounted folder in QVS and schedule reloads as
needed. Use NTFS permissions to hide the folder from standard AP