Interesting topic. I've been aware of the knock off industry for a while in country's like China and Thailand - but about the low quality, mass produced bronze knockoffs produced in their foundries. Makes sense that the same would apply for mass infringement on painting copyrights as well. Here's a site where some artists are fighting back and actually shutting down some of these foundries.
http://www.bronzecopyright.com/index.php?lang=eng
As a side note, I was alerted earlier this year when someone saw several of my one of a kind originals being sold on ebay from someone in China. The person actually lifted photos of my work from my website and had them for sale on ebay for thousands. Although this was not a case of copyright infringement - just outright fraud. I alerted ebay and they had the person's account shut down immediately.