>The capacity of memory sticks and such is growing everyday. They make it very easy for a user to copy entire files off the network and walk off with them.
>
>Is there anyway to prevent this?
>
>Assume that the user needs read/write access when they use the application.
>
>This would be a different way to express the question:
>
>Can I specify that only one program has read/write access to the files unless the user has sufficiently high rights? (I still need to copy the files from time to time.)
>
>Ummm... Two programs (system backup program, etc.)

One option would be to encrypt the data with something like Cryptor. That way, even if the tables are copied it will be difficult to extract their information.

IIRC some people have stored their data in a hidden folder. However this is a simple trick that won't fool anyone with a modicum of cracking skills.

Besides that, as Hilmar suggests you're looking at client-server, or an emulation of such using VFP.