A Flickr member has posted one of your images, implying that he created it
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This is Flickr's advice
If you see photos or videos that you’ve created in another member’s photostream, don't panic. This is probably just a misunderstanding and not malicious.
A good first step is to contact them via FlickrMail and politely ask them to remove it. If that doesn't work, please file a Notice of Infringement with the info.yahoo.com/legal/us/yahoo/…
who will take it from there. Check out the “Copyright/IP Policy” link in the footer of every page for more information.