The Digital Millennium Copyright Act (DMCA) is U.S. copyright legislation that implements the World Intellectual Property Organization (WIPO) Performances and Phonograms Treaty and the 1996 WIPO Copyright Treaty. DMCA prevents the unauthorized duplication of digital copyrighted works by regulating digital intellectual property (IP) owners and consumers. Since DMCA was passed in 1998, similar bills and legislation have been adopted internationally.

The DMCA includes five titles and was initially criticized for its aggressive nature. Over time, amendments have lifted certain restrictions.