In terrorem

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In terrorem, Latin for "in [order to] frighten," is a legal term used to describe a warning, usually one given in hope of compelling someone to act without resorting to a lawsuit or criminal prosecution. For example, many intellectual property attorneys send in terrorem letters, which threaten litigation absent compliance with the written request, to persons that are violating their clients' trademark rights before resorting to court proceedings.

In terrorem Clauses are also used in wills to keep beneficiaries from contesting the will by either completely disinheriting them from any share or reducing their share to a nominal amount (sometimes just $1). These clauses are not uniformly recognized, or in some states such as New York, are unnecessary.