|
You could write a program to "brand" the image,
as long as the webmaster didn't fuck with the orginal.
Take the 8th bit of the first 38 pixel's RGB values
and use them for the data storage. This will only
put the colour off on the first 38 pixels very slightly.
(38 for the scheme discribed, we could do better if
it was an ID referanced to a database.) A simple
program could check right on the submittion verification
as they do a thumb is really link to a pic check.
I have a program that brands an ID into all our
orginal content "somewhere" in the middle and in
a "pattern" that jpeg doesn't like to further compress.
98% of the time when I pull a pic of ours off the net
that has been borrowed, I can still run my verifier
across it and pull out the ID. It's only when the theif
messes with the brightness and contrast greatly that
I lose the ID tagging.
Sending a copy of the verifier program with a cease
and desist letter gets stuff taken down very quickly.
... It's old technology that I borrowed from a program
that wrote hidden messages into gif files from the
BBS days.
|