Is there a program out there that allows 'friends' or 'members' only to share files? My mother's needlepoint group has files they use to exchange patterns, etc that are enormous, and there are THOUSANDS of them. They'd like to do file swapping, but have the files protected by some mechanism (these patterns mean a lot to them). Anything simple enough to set up that doesn't require a server grade machine, or a network admin to run that has that kind of capability? The list of 'members' would be less than a hundred, small enough that it oculd be typed in easily in almost any format.