Which raises questions, what the hell kind of policy are they going to have if your motherboard goes or the harddrive...The 2 to 4 years represents the life of the hardware.
They are indicating that is how long your license will last because you will change your hardware enough to invalidate the key in that time frame.
They keep repeating that the license is tied to the "device" for the life of the device so the hat fits.
The key cannot be transferred to a new machine.
You have to buy a new one.