The latest update to El Capitan (10.11.5), which I received automatically via the app store today, contains a link to "information" about Apple Product Security Key.
The information is not understandable by a non-coder or non-techie like me.
I am highly intelligent, and I need clarification, because the information provided does not appear to relate to anything that I am able to see.
MacBook
Pro, OS X El Capitan (10.11.2)