TinEye's a very good resource. However, there are about a couple kajillion photos out there on the web, and TinEye hasn't even come close to indexing all of them. From Wikipedia:
Quote:
As of 19 May 2010, TinEye claims to have indexed 1,475,683,239 images for comparisons. However, this is a very small proportion of the total number of images available on the World Wide Web.
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http://en.wikipedia.org/wiki/TinEye (footnotes redacted) The footnote to that second statement notes that Flickr alone, for example, hosted over 4 billion images as of October, 2009 (that number has only gone up, since then).
So just because TinEye doesn't return any results for a photo you feed to it, you can't conclude it's not stolen.
Cheers,
bcg