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POPrevent image hotlinking in Google Image Search
 

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    <p>Just recently, Google has introduced a new interface of their Image Search. From January 25 2013 on, full size images are shown directly inside Google, without sending visitors to the source site. I came across a site, that apparently has developed a sophisticated approach to prevent users from grabbing images from Google by introducing some sort of watermark <strong>dynamically</strong>. To see this, please search on the new Google Image Search interface for images by "fansshare.com". This link should be working: <a href="https://www.google.com/search?hl=en&amp;tbo=d&amp;tbm=isch&amp;q=jessica%20biel%20gq&amp;oq=&amp;gs_l=&amp;biw=1183&amp;bih=708&amp;sei=3VkXUcLdFsnHswbd4oHIDQ#hl=en&amp;tbo=d&amp;tbm=isch&amp;sa=1&amp;q=site%3afansshare.com&amp;oq=site%3afansshare.com&amp;gs_l=img.3...0.0.2.10846.0.0.0.0.0.0.0.0..0.0...0.0...1c..2.img.AWfe_f3vWxE&amp;bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&amp;bvm=bv.42080656,d.Yms&amp;fp=da7d521736767550&amp;biw=1183&amp;bih=708">Google Image Search</a>. If not, simply enter "site:fansshare.com" in Google search input filed. Be sure to be on the new search interface, though.</p> <p>How does fansshare.com achieve this? I couldn't figure it out ...</p> <p><strong>Update:</strong></p> <p>fansshare.com adds a GET param to all of their image URLs, like <em>?rnd=69</em>. Example image URL: <a href="http://fansshare.com/media/content/570_Jessica-Biel-talks-Kate-Beckinsale-Total-Recall-fight-5423.jpg?rnd=62">http://fansshare.com/media/content/570_Jessica-Biel-talks-Kate-Beckinsale-Total-Recall-fight-5423.jpg?rnd=62</a></p> <p>This image URL works for a few calls or seconds, after which a redirect takes place to a cached, watermarked image: <a href="http://fansshare.com/cached/?version=media/content/570_Jessica-Biel-talks-Kate-Beckinsale-Total-Recall-fight-5423.jpg&amp;rnd=5810">http://fansshare.com/cached/?version=media/content/570_Jessica-Biel-talks-Kate-Beckinsale-Total-Recall-fight-5423.jpg&amp;rnd=5810</a></p> <p><strong>Edit:</strong></p> <p>We have finally managed to fully mimic FansShare's hotlink protection and we've published our findings in the following, extensive blog post:</p> <p><strong><a href="http://pixabay.com/en/blog/posts/hotlinking-protection-and-watermarking-for-google-32/">http://pixabay.com/en/blog/posts/hotlinking-protection-and-watermarking-for-google-32/</a></strong></p>
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    1. COWhen someone requests an image, they send some information like what their referrer is, their web agent and so on. Google does all this too when they request images on your site, so they can index them in Google Image Search. So, wait for GIS to index your image, check the log for what their message was and then you can write code that checks for that and returns a watermarked version of the image :)
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    2. COSeems to be way more behind this: You don't see the watermark in Google's thumbnails. It only appears when enlarging the image on Google. I'll update my question with some more info now ...
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    3. COPerhaps it makes two queries, one for the thumbnail one for the enlarged version? Or perhaps the thumbnail is so shrunk that you don't notice the watermark anymore?
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