graeme_p - 5:01 am on Sep 20, 2011 (gmt 0)
I find the idea of enforcing through the registrar very disturbing.
I would never use a registrar with that policy, because it puts you in a weak position: assuming you do your best not to breach copyright you could easily have a problem with user generated content, content you buy in good faith that turns out to be plagiarised, disputed copyrights, variations in copyright law between countries, and simple fake claims.
As far as this case is concerned, I suspect a complete perfect copy is the smallest threat: it is helping search engines (and perhaps even users) realise it is the duplicate. There has been a perfect copy of my site in Russia for years, and I it never ranked for anything. I suppose I should send Google a DMCA. The big threat is bits of your content being ripped off big sites.