lock-in

noun

• 1an arrangement according to which a person or company is obliged to deal only with a specific company.
• a period during which a person or company is bound by the terms of a contract: [as modifier]:a lock-in period

• 2British a period during which customers are locked into a bar or pub after closing time to continue drinking privately.

• 3a protest demonstration in which a group locks itself within an office or factory.