You just got a letter that says your photos, music, writing, or website copy were used without permission, and it asks whether the work is "registered with the U.S. Copyright Office." That question is about a formal filing process that puts your claim of ownership into the federal record. In the United States, copyright exists automatically when an original work is fixed in a tangible form, but registration is the step that gives that right stronger legal backing.

Registration matters because it changes what you can do in court. Under the Copyright Act of 1976, a copyright owner generally must have a registration issued or refused by the U.S. Copyright Office before filing an infringement lawsuit for a U.S. work. The Supreme Court confirmed that rule in Fourth Estate Public Benefit Corp. v. Wall-Street.com (2019). If the case goes into federal court, it starts in a district court, with appeals going to a circuit court and then, in rare cases, the Supreme Court.

Timing can also affect the value of a claim. Under 17 U.S.C. § 412, registering before the infringement begins, or within three months after first publication, can open the door to statutory damages and attorney's fees. Without timely registration, a case may be limited to actual losses and profits, which can be harder to prove.