DOT locked for the duration of the parachain’s lease period remains in the index for the campaign, and it is reserved and unavailable for other uses such as staking. At the conclusion of the slot lease, the full amount of DOT is unlocked, after which it is once again free to be used for activities such as transfers, withdrawals, and staking. For crowdloans, contributed DOT is locked from the moment the contribution is made until the end of the lease, unless the crowdloan campaign is unsuccessful in securing a slot via auction, in which case contributed DOT is unlocked at the end of the campaign as specified by the parachain team.