On December 2, 1766, the Swedish parliament passed legislation that is now recognized as the world’s first law supporting the freedom of the press and freedom of information. Narrowly, the Freedom of the Press Act abolished the Swedish government’s role as a censor of printed matter, and it allowed for the official activities of the government to be made public. More broadly, the law codified the principle—which has since become a cornerstone of democracies throughout the world—that individual citizens of a state should be able to express and disseminate information without fear of reprisal.

The notion that the press should be free could have emerged only after the press itself had become commonplace. The invention of mechanized printing in the 15th century led to the proliferation of books, newspapers, and other publications that spread ideas faster and farther than ever before. However, because of the potential for these ideas to challenge official power structures, some political and religious authorities actively suppressed publications that they deemed subversive.

An early defense of press freedom was made by the poet John Milton in his 1644 pamphlet Areopagitica, written in response to the British Parliament’s passage of a law requiring the government to approve all books prior to publication. “Truth and understanding,” Milton argued, “are not such wares as to be monopoliz'd and traded in by tickets and statutes, and standards.” This sentiment appeared to win legal recognition on the other side of the Atlantic when in 1733 New York newspaper publisher John Peter Zenger, in a landmark jury trial, was acquitted of seditious libel on the grounds that the articles he printed, which were harshly critical of New York’s colonial governor, were nonetheless based on fact. Twenty-five years after the Freedom of the Press Act came into force in Sweden, the framers of the U.S. Constitution enshrined the same principle in the document’s First Amendment: “Congress shall make no law…abridging the freedom of speech, or the press.”

While many countries have come to understand freedom of expression as a common good—indeed, it is one of the rights enumerated in the Universal Declaration of Human Rights—state censorship and regulation of the press have not entirely disappeared. The international organization Reporters Without Borders (RSF) monitors conditions for journalists around the world and ranks countries by their degree of media freedom. Countries that rank toward the bottom of RSF’s list include those that maintain various forms of state media and impose restrictions on independent outlets, such as China, Russia, and North Korea.