The security deposit is an amount determined by DRIVE4EVER according to the car chosen and the characteristics of the rental. It is retained on your credit card for the duration of the hire period and returned when the car is handed over. The amount is not debited from the invoice, it is not charged by DRIVE4EVER, just blocked. The deadline for unlocking may vary according to the credit card company. Once the vehicle has been inspected, DRIVE4EVER asks for it to be unblocked as soon as the car is returned, after which it is the responsibility of the credit card company to make th e amount available again.