My extension has been stolen and is now being sold for lower price

Question

I am selling a Magento extension inside Magento Connect. Somebody bought it, copied entire code, just renamed it and now he is selling it in Magento Connect for lower price. My licence does not allow that.

This was my best selling extension, I put so much effort to make it perfect and now this clearly lowered my sale.

Do I have any chance? The person is from Asia and I am from Europe. It would be probably nearly impossible to make any legal action unless I don't invest USD 10k+ for legal adviser. What options do I have left?