Well thats really good.On-off purchase.
That includes updates for a year. After the update period, you can choose to pay for updates/support into the future or keep running that version for as long as you like. So one-off payment most likely.
Blue Iris is up to 64 cameras for one fee, (not a licence per camera).
^my understanding from a dedicated NVR user pov.
With regards to the hardware, would you be able to advise me what I need to buy? Would it be a small form factor - just wondering about CPU, motherboard, RAM etc - I already have 2x 6TB surveillance drives in my NVR that I can use.