I would write a companion program that works like this:

$ protector -lock filename.exe

and

$ protector -unlock filename.exe

the -lock switch would simply get the file size of filename.exe
then generate a random chunk of data the same size, xor it
with filename.exe and write the chunk data to a thumbdrive.
filename.exe would now be 'garbage'

the -unlock switch would then just read in the chunk of data
from the thumbdrive then xor filename.exe with it to restore
the file.

this will stop most anyone from getting at filename.exe
without the thumbdrive

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