Is there software out there to manipulate quantization tables or spoof another camera?

Mr. Bill,
This news group is monitored by the Precrime Force of The United States Department of Justice.
You are obviously planning to commit a crime and document it with your camera.
Report to your local constabulary for persecution.
Resistance is futile. You will be assimilated.


John

"billo" wrote in message ...
I just bought a new Nikon D90 camera -- the first higher-end consumer
camera I've ever had. A friend of mine was telling me that every
picture I took can be traced back not only to my camera, but to
roughly when I took it -- not on the date and time in the EXIF data,
but a shutter count that acts like an odometer. He said folk could
trace it back to my camera, at least to the model, by looking at jpeg
quantization tables that are model specific.

While I guess there's no big issue with someone tracing a photo of my
cat I post on my website back to my camera, there's something about
the libertarian side of me that just doesn't like the idea.

Does anybody know of software (as always, preferably open source) that
will spoof the quantization tables so that doesn't look like my D90? I
guess I'm looking for the photography equivalent of macchanger
software...

Thanks!