The Digital Millennium Copyright Act, enacted by Clinton on October 21, 1998, served as the first significant amendment to the Copyright Act since 1976. The DMCA provided a framework for sound recording copyright owners and recording artists to seek public performance royalties under statute, which proved to be a landmark achievement for the recording industry. The law included a provision reiterating the "fair use" of copyrighted materials, and another provision that exempted internet service providers from responsibility for inadvertently transmitting copyrighted works. That same month, Clinton also signed the Copyright Term Extension Act, which retroactively extended copyright protection and stopped copyrighted works entering into the public domain for an extra twenty years.