An overview of various significant texts relating to this right and its limits, particularly in France and the United States. The attacks against Charlie Hebdo on January 7, 2015 rekindled the debate on freedom of expression, particularly on the “right to blasphemy” defended by the cartoonists. The freedom the press is governed by the law of July 29, 1881, which prohibits provocation, defamation and insult. In particular, it prohibits defamation “against a person or a group of persons because of their origin or their affiliation or non-affiliation to a particular ethnic group, nation, race or religion." The authors present various significant texts relating to this right and its limits, particularly in France and the United States.