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prescriptive

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Prescriptive describes the imposition of rules, or something that has become established because it has been going on a long time and has become customary. (adjective)

A handbook dictating the rules for proper behavior is an example of something that would be described as a prescriptive handbook.
An easement, or a legal right to pass on a driveway, that has become legal simply because the people have passed on the driveway for so long is an example of aprescriptive easement.

See prescriptive in Webster's New World College Dictionary