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Originally Posted by AdvertisingSex
that would be a nice tool to have when/if I ever open advertisingsex.com
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Just re-read your question.
I'd suggest using EXIF data. Although it can be read / removed by most, I have a suspicion that search engines use this in their results (others can verify) - and languages like PHP have inbuilt support for reading / writing exif data.
It would be no stretch to code a script that automatically spidered google / yahoo images and auto read / checked EXIF data on matching images.