virtualbox.org

I wonder is there ANY way to lock/secure VDI from changes (for ex, a password or smth. alike)?
We need to give our users preconfigured VDIs on portable HDDs, but they can move them home, open/mount this VDIs on home Virtualbox installation and change [thus damaging] the image, losing functionality.
So I wonder how can I prevent such changes to VDIs?

Vmware has VMWare ACE product, but it's to slow cause entire image is encrypted (moreover, it's not free )
All I need is to prevent any changes to immutable VDI (including converting it back to normal).

Is there any way to achieve this?

There is no way to prevent someone from modifying the base image, if they are detemined to do it. However it should be possible to create a self contained VM based on one immutable image plus a difference file. The immutable base can then be made read-only and hidden, and it will still work.

This doesn't actually prevent anything, but it should make accidental damage more difficult. Deliberate sabotage is of course another matter.