What the designated agent does
A service provider that wants to rely on the DMCA safe harbor for material its users post generally needs to designate an agent to receive notices of claimed infringement. The designation is filed through the Copyright Office's online directory, and the agent's contact details should also appear on the service's own website. The agent can be an employee, an outside lawyer, or a role such as a copyright department, so long as notices actually reach someone who acts on them. Designation is not the whole safe harbor, but courts have generally treated the protection as unavailable for periods when no agent was on file.
Keeping the designation current
Designations in the directory expire unless they are renewed on a set cycle, and a lapsed designation is a common gap for companies that registered once and moved on. Changes in company name, address, or the person handling notices should be updated promptly. If several related companies run services, each may need its own designation, and the alternate names and websites the service uses should be listed. Assign someone to watch the inbox shown in the directory and set a renewal reminder. Notices that go unread can undercut the very protection the designation was meant to provide.
Other meanings and next steps
Sometimes people use the phrase to mean someone who files registrations or sends takedown notices on a creator's behalf. Anyone sending notices for you should understand that a notice includes a statement under penalty of perjury that the sender is authorized to act. We review whether your designation is on file and current, how notices and counter-notices are handled internally, and whether your repeat infringer policy is written down and applied. Bring the directory listing if you have one and a description of how user content enters your service. Many services also publish a short page explaining how to send a notice, which cuts down on incomplete submissions.