NOTE: use Perl; is on undef hiatus. You can read content, but you can't post it. More info will be forthcoming forthcomingly.
All the Perl that's Practical to Extract and Report
several minutes ago. We don't need no stinkin' tactical nukes.
(By the way, do you have change for 10 million people?) --lwall
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Hash search? (Score:1)
Surely Flickr or Google or someone has an index of their images by checksum? You could upload the image, they could compute a hash (MD5, SHA, etc) and look in their index to see if they have a byte-identical image on record. Odds are that the unattributed image has not been altered.
I googled for "image match" and found this service: TinEye [tineye.com]. It succeeded on a couple of Flickr images I tried, but failed on a few more obscure ones.
If you wanted to be mean... (Score:1)
Depending on how anal you want to be about it, you could check the referer header for these images and if you control the webserver serving them you can alter them in a way that tells the user that he's a jerk for stealing your photos. I can think of some pretty funny ways to do this to make it less evil:
+ turn the image upside down
+ put a big label across the image saying "Hey, stop stealing my images"
+ turn the image into an animated gif that after a few seconds will become a picture of something else whi