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From: aii@pucc-k (mackenzie)
Newsgroups: net.micro
Subject: Copy Protection
Message-ID: <1377@pucc-k>
Date: Sun, 30-Mar-86 20:44:03 EST
Article-I.D.: pucc-k.1377
Posted: Sun Mar 30 20:44:03 1986
Date-Received: Wed, 2-Apr-86 00:45:04 EST
Organization: Purdue University Computing Center
Lines: 17
Keywords: RFI


Ultimate Copy Protection:

I heard from a Tempest Engineer ( read noise expert ) that FCC standards
for noise are not measured for any particular piece of software. They just
turn the computer on and measure it's RF interference. As such, it would
be possible to write a subroutine which maximized RFI. This RFI could be
used to send a message in morse code such as HELP ME, I'VE BEEN KIDNAPED
FROM XYZ COMPUTER COMPANY.
Under this system when a product detects that it has been stolen, instead
of stopping, or destroying the users hard disk, it would continue to run
as usual, occasionally stopping to broadcast a message.

Just an Idea.  I don't intend to implement it.

				Michael MacKenzie
				Purdue University