Non-aggression principle
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The non-aggression principle (NAP) is a concept in which "aggression" – defined as initiating or threatening any forceful interference with an individual, their property or their agreements (contracts) – is illegitimate and should be prohibited. Interpretations of the NAP vary, particularly concerning issues like intellectual property, force, and abortion.
Like the Golden Rule, the Non-Aggression Principle follows an ethics of reciprocity, in the sense that whether a person's action is permissible, depends upon the preceding actions of others.
The non-aggression principle is considered by some to be a, or even the, defining principle of libertarianism. It is a common principle among libertarians of both minarchist and anarchist beliefs.