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The Non-Aggression Principle[a] (NAP) is a concept in which "aggression" – defined as initiating or threatening any forceful interference with an individual, their property[b] or their agreements (contracts) – is illegitimate and should be prohibited.[1][2] Interpretations of the NAP vary, particularly concerning issues like intellectual property, force, and abortion.
The Non-Aggression Principle is considered by some to be a defining principle of libertarianism[3] and is also a prominent idea in anarcho-capitalism, voluntaryism, and minarchism.[4][5][6][7][non-primary source needed]
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...except in response to the initiation ... of similar forcible interference ....