>>>>Do you know of any freeware that would let block/unblock access to usb drives?
>>>
>>>You only need to change a registry setting, http://www.redmondpie.com/disable-usb-storage-in-windows-8-7-how-to-guide/
>>>
>>>In Tools->Task Pane->Solution Samples you find out how to work with the registry.
>>
>>Thanks Tore. I found similar info while googling. The thing is that I'd prefer a software freeware way to do it.
>
>What can be more "free" than just a few lines of VFP code? Well, it's your decision.

Or a .reg file.