A little-known corner of U.S. trade law is being challenged in court on First Amendment grounds by a group of editors and publishers. “The regulations, meant to keep Americans from trading with enemies, require anyone who publishes material from a country under trade sanctions [Cuba, for instance] to obtain a license before substantively altering the manuscript. The publishers say that keeps them from performing typical editing functions like reordering sentences and paragraphs, correcting grammar and adding illustrations or photographs.”