The main characteristic of the TerraMaster HyperLock-WORM file system is that its WORM feature is based on a file system and is thus not limited by the file service type. It is thus suitable for most common file services, though it can only be set up by an administrator. Administrators can flexibly assign read and write permissions to users and set a protection period. During this protection period, the data uploaded to the device can only be read: it cannot be deleted, modified, or renamed. This protection period can be set for up to 70 years, and, to further improve security, once the protection period is set, it can only extended, not shortened.