DMCA 
Digital Millennium Copyright Act 
The U.S. Digital Millennium Copyright Act was signed into law by President Bill Clinton in October 1998. This controversial law deals with digital rights management by making it illegal to use circumvention devices, software or hardware that allows access to a work under copyright (such as copying commercial movies released on DVD). It also requires that ISPs surrender to copyright holders information about subscribers who may be posting or sharing copyrighted files. In practice, it has interfered with the operation of peer-to-peer file sharing systems, and some people consider it to be unconstitutional. The text of the law is available at http://www.loc.gov/copyright/legislation/dmca.pdf.