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In the past, I sent so many copyright notices to many site owners to remove illegal content, but with limited successForget going to the site owners. Raise a DMCA to their hosting provider. Sometimes, the ISP will tell you to contact the owner. Doing it this way (for me) receives better results - and quicker. It also alerts the ISP that they have infringed someone elses rights.
more to do with the penalty knocking you down as opposed to the scrapers doing so well in the SERP's.
I've found copyscape pretty uselessditto
I am constantly going through all pages of my site and doing checks for content by pasting and copying a unique sentence in Google and seeing what comes up. When I initially started doing this - I was floored. Out of the first 40 pages I checked (out of 440), every page had at least 10 sites that had copied my content.
... ...It's tedious and time consuming, but I go after every single one - mainly through their host.
But you have to continually be checking - every day.
Hope this helps.
I can tell you that in one of my examples, it's a Goo*** exclusive and not happening in Bi**. One search engine knows who is the originator/owner and the other search engine which own 95% of the traffic doesn't. That's the bad part.
[edited by: Robert_Charlton at 6:26 pm (utc) on Nov 17, 2012]
[edit reason] added links, removed search terms [/edit]