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A privateer is a private ship (or its owner) authorized by a country's government to attack and seize cargo from another country's ships.
Prior to the development of international law among European nations, there was no legal recourse for minor grievances. Privateering was a form of covert operation used to resolve these matters without open warfare. The government of a country provided a letter of marque and reprisal to a shipowner that allowed him to arm his ship and attack other ships sailing under a particular flag. In return he received a share of the seized cargo, while the rest went to the government as payment for the grievance.
To the target country, a privateer looked very much like a pirate, and indeed this was the intention. The only difference was that pirates were considered outlaws by all nations, while privateers had immunity from the country that commissioned them. Privateers were sometimes known as "gentleman pirates."
European powers renounced privateering in the Declaration of Paris. Other countries (including the United States) also renounced it under the Hague Conventions.
The United States Constitution authorizes Congress to grant "letters of marque and reprisal," as did the Confederate Constitution. The Confederates used privateers during the American Civil War. Britain also used them against the US after the American Revolutionary War.