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Don't Take an image and call it your own when you know it's not!
While browsing around for freebies and we all do, as many are legit; if you see a digital stamp posted as a freebie, or a digital element posted as a freebie or for sale on someones site, that you know isn't their work. Don't use it. Report it. Stop Theft. Many of the stamps I've seen that are stolen are inferior, they will not print in a high resolution anyway using them is just waisting your time.
Here are some links where you can find out more information.
The Myths and Realities of Digital Image Theft
http://www.redbubble.com/people/bossman/journal/443008-the-myths-and-realities-of-digital-image-theftPlagiarism and Art Theft
There are many more sites to find out even more, in this case when in doubt check it out before using the image, stamp, png, file tube, poser or what have you.
I personally have not experienced my work being stolen. I hope that I never do. I know of many artiest that have had that problem and in the end it hurts everyone in the digital art community.
Thank you for reading my post.