Which entity is responsible for enforcing copyright laws in the United States?

The U.S. Copyright Office is the entity primarily responsible for enforcing copyright laws in the United States. It plays a vital role in the administration of copyright laws, including managing the registration process for copyrighted works and maintaining a public record of these registrations. The office also provides guidance on copyright regulations and policies, assists in copyright education, and contributes to the development of copyright law through research and analysis.

Moreover, while other entities like the Federal Trade Commission, U.S. Patent and Trademark Office, and Department of Justice have roles related to intellectual property and law enforcement, they do not specifically oversee the enforcement and administration of copyright laws. The Copyright Office is explicitly tasked with these duties, making it the correct answer to the question of which entity is responsible for enforcing copyright laws in the U.S.