I've been harrassed by law firms in connection with photograph copyright claims.
In my case it was a law firm in France who also had a presence in the US.
It was a minor claim (they demanded $500). We took the image down immediately, but they continued to demand their cash "settlement" with multiple letters over a year (1 letter every 1-2 months, each one with increasingly aggressive wording).
I eventually got on the phone with the person sending the letters, and turns out they weren't licensed to practice law (in any jurisdiction). I pointed out that it's illegal to misrepresent yourself as an attorney. They hung up and I never received another letter after that.
Good on EasyDNS for refusing to turn over customer data. If they did, I assume their customer would be harassed in a similar manner.