Use File – Change Master Key to encrypt the data source.
The master key prevents unauthorized users to access the data source without knowing the master key. It is highly recommended to apply a master key to the data source if you're using Remote Desktop Manager in a portable environment (i.e. USB Flash Drive, USB Hard Drive).
A master key can be used with the following data sources:
•Devolutions Online Drive
Since version 188.8.131.52, the user is automatically prompted to add a master key when connecting to one of the above mentioned data sources for the first time. The master key is completely optional (yet highly recommended).
Change Master Key