When I was working for a smaller company a few years ago, I discovered a site that would parse your own site and use that to search the web for other sites that are copying your content. It was made more to find scrapers but I was able to use it to find sites that were actually copying the copyright protected content and passing it off as their own.
I can't for the life of me remember what it's called. Does anyone use something similar or have any idea what this is called?