MicrostockGroup

That's true 

I don't care about etiquette in such situations. I dare to assume that this image wasn't purchased to be a composite of that caliber.

I'd definitely contact the member asking where they purchased it from.

This should quickly resolve your issue.

Send that message twice if you don't get a response.

If no response after second time contact Yahoo with a DMCA notice - done.

Please don't take this as legal advise. This is how I do things and so far I've never found one user who did purchase the image.
Maybe this would be the first time, who knows. I'd give it a shot.

Thanks for hijacking, as this is for educational purposes!

This is redistributing the image completely free. I could save it to my computer right now and spread it, in random free torrents all over the web.

 For my part, I would contact Shutterstock, saying that one of their buyers is actually spreading their collection for free all over the internet. He/she even enter this image in a contest ... omg sigh

First things first: Contact the Flickr member first and ask in a polite manner where they obtained the image.

You can do it two ways. Either you identify yourself as the copyright owner or you act like as if you want the image as well and maybe you get a link where they took your image from.
You may hit two birds with one stone this way.

Once this is settled you know what to do.

In IS, they say:
I underlined the text above because it is always a question: what is 'fundamentally modified or transformed"? It seems a very subjective matter. The background used in another thread seems a valid usage to me (the original image can not be extracted), but in the examples here I am not so sure.

Yep, the one on flickr is gone. Nice work!
Love your avatar, by the way!

I have a question...  I buy images from DT and SS all the time for use on my blog and blogs of my clients.  I never claim copyright on the images because they aren't mine, but anyone can get them off my web site by right-click save or just doing a screen capture (since I buy XS web size).  I haven't been making a habit of adding an attribute to each image used, but I do put links on my "about" page to all of the artists portfolio whose images I've purchased (with my affiliate code, of course ).

Other than implementing some sort of "right-click" protection, anything else I should be doing?

The sad thing is the only ones you know were stolen are the ones tineye has found so far. As time progresses and tineye has crawled more of the web will we all know how huge the problem really has gotten.

Every time a buyer posts one of those pictures on their website the next person could come along...right click...save as...and use on the next website waiting for the next person to do the same. Some probably use them for those "2000 stock photos for $1.00" cd's depending on the size. That is a little hard to prevent. No telling how many pictures are floating around out there that this has been the case. If you a designer and photographer and buyer, you know that this isn't right but an average everyday person wouldn't.

About the only way a person could know who actually purchased the photo and who didn't was if the stock sites actually provided details about the buyers, but I doubt that will ever happen.

True! It's amazing how few people seem aware it's not ok to just right-click, save and use for whatever needed. Today at work i was talking about image theft and they all were genuinely surprised. Turns out they're all 'right-clickers', for their websites, for our center magazine etc (not anymore now ). As soon as it's on the net it seems to lose all it's value and becomes 'take what you need'.

The moment they invent some embedded license/usage code, two hours later it's cracked and you will have "image cleaners" around. Look what happened to the WMA format and long ago, to the Region Codes in DVD's. The only ones that suffer are the legal buyers.

Yep, Yahoo just removed the image from Flickr.

All is well.