The DMCA is the short name for the Digital Millennium Copyright Act.
The DMCA is copyright legislation that was passed in the United States in 1998. Its intended purposes were to bring U.S.copyright law more into harmony with international norms and to address many of the new concerns that digital technology and file-sharing raised. The DMCA contains the now-notorious anti-circumvention provisions, which made it illegal, even for a legitimate user, to avoid, break or disable any technological measures protecting content. It also created what are known as “safe harbors”, descriptions of behavior where Internet service providers could be certain they would not be legally liable for the actions of their users.