Sharding your files provides a substantial baseline of security. Since each document is divided into tiny pieces (shards) when stored and apportioned throughout our network of masternodes when shared, nobody except you and authenticated users have full access to any file.
For those who need to take it a step further, AXEL Go has the capability to password protect files. When you choose this option, a password must be entered before viewing or downloading the file. These files are encrypted using the trusted AES-256 method to add an extra layer of safety.