Whole hard drive encryption software that causes files that are copied over network to be unreadable
I'm working a project for a company that needs to insure that the documents and files stored on the hard drives of its executives are completely unreadable if any of the IT employees copy these files from the executives' hard drives to their own computers.
While only a few employees have domain admin access and would be able to do this in the first place we need to insure that if this is ever done that the files that are copied will be highly encrypted and won't be able to be read since this has already been done by former domain admins.
What kind of whole hard drive encryption software will do this?
Is this something that Symantec PGP whole hard drive encryption will do once the entire Windows 10 OS and hard drive of a computer is encrypted?