[IP] Privacy Question for IP list

[Dave Farber <dave@farber.net>]

Delivered-To: dfarber+@ux13.sp.cs.cmu.edu
Date: Thu, 15 Apr 2004 08:54:33 -0500
From: Tim Onosko <tim@onosko.com>
Subject: Question for IP list
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Dave Farber:

I have a privacy issue question, and perhaps someone on the list can answer it.

I recently wondered if and how programs like Adobe Photoshop embed 
information in photographic data to identify creators.  There is non-visual 
data, so-called "metadata," that is part of JPEG images, for instance.  So 
I decided to open a JPEG with the Notepad program in Windows to poke around.

In doing so, I found several references to "UUID" numbers, and what appear 
to be long series of numbers that look like serials and/or MAC 
addresses.  So my question is this:  Can you trace a JPEG back to someone 
who created or modified it?  If not, what do the UUID numbers in the 
metadata pertain to?  I was under the impression that UUIDs were always 
associated with Ethernet machine identifiers.

Thanks,

Tim Onosko

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