How to stop someone from using art illegally?

I have a friend on Deviantart whose artwork is being stolen and appearing in products that are being sold for profit without their permission on eBay and Amazon. Does anyone have any suggestions on how to get that to stop? They are very upset that their art is being used by someone without their permission to make money. Please help. Here are some links as examples of their artwork being stolen and placed on products and sold.

http://www.amazon.com/...00EROYVZK/

http://wanelo.com/p/6181891/rainbow-wolf-for-iphone-4-4s-black-case

http://www.amazon.com/...00E4FS806/

http://www.amazon.com/...00E7O22TM/

You need to call a lawyer tomorrow if thats really your artwork. They will talk to you about your options.

Contact a lawyer ask them to send letters to the retailers and contact Amazon and eBay to let them know of that situation.

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