Also.. The the service provider must have a designated agent registered with the U.S. Copyright Office to be protected under safe harbor.
Here's the list of registered agents.
The threshold requirements that service providers will need to satisfy in order to qualify for the safe harbors are:
1) Adopting and implementing a policy of terminating the accounts or subscriptions of repeat infringers;
2) Informing subscribers and account holders of the repeat infringer policy;
3) Accommodating and not interfering with standard technical measures used by copyright owners to identify and protect their works;
AND
4) Designating agents to receive takedown notices from copyright owners and recording those designated agents with the U.S. Copyright Office;
THE DIGITAL MILLENNIUM COPYRIGHT ACT (DMCA)