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Re: ACAD Protection

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You could try PGP at

It has a binary  "signature verification" option that would be useful for
what you seem to want.  (Actually, I'm surprised noone has mentioned it yet

-----Original Message-----
From: Mark Middlebrook [mailto:markmid(--nospam--at)]

>> Is it possible to enclose a coding that will produce a message on any
drawing(s) revised without authority, a bit like a hidden cookie that would
require serious hacking to find and delete? <<