Holly:

There are several ways to protect information on the Macintosh. One way is to create password protected partitions on the hard disk. Another is to encode a file with a program that demands a password to decode it. I could also rig up some kind of password scheme in various Archipelago stacks, but this would be a nuisance and could be easily bypassed by resourceful stackhead snoopers.

You might ask Robert how much the various partioning and scrambling programs cost and which he recommends. My feeling is that the whole business is an expensive and sometimes dangerous nuisance that should be avoided if at all possible. Just conceal your Archipelago folder inside another boring folder (like "Dental Records" or something), and ask your fellow users not to snoop.