数字千年版权法是一个美国版权法律，它实现了两个世界知识产权组织（WIPO）在1996年通过的条约。它以刑事犯罪立法的形式禁止了受版权保护（通常是受「数字内容权利管理，DRM技术控制」）的技术、设备或服务的生产与传播，以及绕过DRM本身的行为。此外，DMCA还加大了对于互联网侵权的处罚。1998年10月12日，美国参议院全票通过了该法，随后，时任美国总统比尔·克林顿在10月28日签字使其正式成为法律。DMCA修订了美国法典中的第17条，延长了「版权」的范围，同时限制了在线服务提供商为其用户侵犯版权的责任。

The Digital Millennium Copyright Act (DMCA) is a United States copyright law that implements two 1996 treaties of the World Intellectual Property Organization (WIPO). It criminalizes production and dissemination of technology, devices, or services intended to circumvent measures (commonly known as digital rights management or DRM) that control access to copyrighted works. It also criminalizes the act of circumventing an access control, whether or not there is actual infringement of copyright itself. In addition, the DMCA heightens the penalties for copyright infringement on the Internet. Passed on October 12, 1998, by a unanimous vote in the United States Senate and signed into law by President Bill Clinton on October 28, 1998, the DMCA amended Title 17 of the United States Code to extend the reach of copyright, while limiting the liability of the providers of online services for copyright infringement by their users.