martinibuster - 12:00 am on Feb 12, 2012 (gmt 0)
It's a battle that should be fought. Constant copying may result in the steady loss of your rankings and income. It has been the case in the past that my rankings dropped as more sites copied the content and that my rankings returned after I had them take it down. However Google seems to have made some inroads with this problem. The copying doesn't seem to be having the negative effect that it once did. Nevertheless, I think it's a good practice just in case.