A locker is NordLockers’s encrypted folder. It contains your files as well as the configuration data. This is also the reason why you need to compress the locker before you send it as an email attachment. We highly recommend accessing your lockers only through the NordLocker app. Messing with your lockers through other programs may damage the configuration files and destroy your encrypted data.
No one except you can access the files you put in a Locker unless you give access to other people through the Add user access option in the NordLocker application.