lockbox

[ lok-boks ]
/ ˈlɒkˌbɒks /

noun

a strongbox.
a rented post-office box equipped with a lock.
Also called lockout box. Television. a closed box, usually fitted with a lock, containing electronic equipment to unscramble cable television pictures for subscribers only: used especially to prevent children from watching programs with explicit sexual content.

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Origin of lockbox

An Americanism dating back to 1870–75; lock1 + box1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020