Not always. Sometime it requires digging in to find the original author. However, to identify the stolen image is not that difficult. Checking the blog of the person say a lot in the first place. Then google search giving plenty links to the image already rings the bell. Then I do question the person that submitted the image if that is original photo. If it is original then they easily prove it. If not, they either admit or start making excuses which have no solid background. If we all participate we can minimize this kind of behavior. Thank you so much for your help. Tomas