BLE UART example pairing? password?

I noticed when using the UART BLE Example that there is no password or pairing request to connect to and use the device. 

Everything works fine, and I even implemented my own little password thing that has to present a password over the active connection before itll start sending data over the UART connection. 

The trouble is, there is no paring password or code, or password in order to connect. I cant figure out how to fix that situation, any ideas? 

This is causing me a problem in the Denial of Service area. Someone can connect to the device, and just leave it idle and connected, preventing an authorized user from connecting. This is starting to happen to me in school situations because of nefarious students.