Ah, I have full access to it, and I thought everyone had access to it. It turns out that even after I disconnected my VPN, my browser kept my institutional login, and that's why I still had full access, which made me think it was available to everyone for free.
It's a pity
because it is a great encyclopedia
It is a very useful reference when you want to look up something about lubrication and lubricants.
However, if you are a student, staff, or faculty in a university
, you may have free full access through VPN or on your school's network, as most universities are subscribed to Springer. I know most people aren't, but at least those can access it.