I agree the offline requirement is debatable how well it would secure anything and that paid for anti-virus is not necessarily going to make things more secure. Nevertheless, this is what they require and is clearly stated as a requirement in a legally binding document. Any deviation from their stipulations could result in my loss of research privileges and criminal charges. So, it matters little what you and I might think is best, these are non-negotiable requirements.
As for research I can figure many things out. I figured out how to run ESXi by myself, but I have no formal computer training and can’t program.
I don’ need a program to handle real time intrusions. I just need a robust plan. For example, Digital photos taken at archives, transferred to laptop in reading room (laptop clean install of OS and never connected to internet during research period (?)), camera memory deleted. Laptop usb/hard drive password protected and individual photos encrypted/password protected. Usb/hard drive stored in a locked safe at such and such address… you get the point. Not sure about the laptop not connected to the internet as they require all updates to be installed (part of binding legal agreement).
What I’m trying to understand is what the most robust way is to secure the actual digital files beyond passwords.