VirtualBox "Appliance is not signed" Error Message
Kicksecure™ does not use this signing mechanism, nobody else does either. Use provided OpenPGP signatures instead.
If you see the following
Appliance is not signed error message.
Figure: Appliance is not signed message
It can be safely ignored. 
Use provided OpenPGP signatures instead, see: Verify Kicksecure Images.
- Kicksecure does not use this signing mechanism and nobody else is known to use it either. VirtualBox provides neither documentation on how to use this feature nor a tool to use this feature. The provided OpenPGP signatures are a more complete and secure replacement of this feature.