Nec vi, nec clam, nec precario
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Nec vi, nec clam, nec precario, is a Latin legal term meaning 'not by force, nor stealth, nor licence'. It is the principle by which rights may be built up over time, principally public rights of way in the United Kingdom. Specifically, if a path is used – openly, not against protests, and without permission of the landowner – for an extended period (20 years) then a permanent legal right to such use is established.