first of all, they will not have the files due they are located on netlogon share.
second, they have to be very good hackers to scan the info out that secured executable (it is first translated to exe where you allready need editor that can edit in hex and then that is crypted which is hard enough for cracking programs too.)

btw, just came to mind that probably the files that users generate by using this soft are deletable by this same user. so can't you do a logoff/shutdown script that deletes them?

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