Copyright
On October 9, 2002, Zittrain and Lawrence Lessig argued a landmark case, known as Eldred v. Ashcroft, before the United States Supreme Court. As co-counsel for the plaintiff, they argued that the Sonny Bono Copyright Term Extension Act (CTEA) was unconstitutional. The court ruled 7–2 on January 15, 2003 to uphold the CTEA which extended existing copyrights 20 years, from the life of the author plus 50 years, to plus 70 years. In the words of Justice Ruth Bader Ginsburg, the petitioners did "not challenge the CTEA's 'life-plus-70-years' time span itself. They maintain that Congress went awry not with respect to newly created works, but in enlarging the term for published works with existing copyrights." The court found that the act did "not exceed Congress' power" and that "CTEA's extension of existing and future copyrights does not violate the First Amendment". In 2003 Zittrain said he was concerned that Congress will hear the same arguments after the 20-year extension passes, and that the Internet is causing a "cultural reassessment of the meaning of copyright".
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