Wheaton v. Peters 1834The major issue in the case, and its importance for American law, was the conclusion that the opinions of justices and by extension other documents written by public officials acting in their official capacity belonged to the public. Such documents were forever in the public domain and immune from copyright.
Paul Finkelman & Melvin I. Urofsky, Wheaton v. Peters, in Landmark Decisions of the United States Supreme Court 45 (2003), http://library.cqpress.com/scc/lndmrk03-113-6430-338550.