A green dot means GuardedID® is activated with a valid license and protecting you when you enter any keystrokes on your keyboard.
Once you download GuardedID® a “G” appears in the Dock. Four variations explain when GuardedID® or Apple is protecting you as you type on the keyboard: a red exclamation point (!), a green dot (.), a red dot (.), and a green dot (.) with a white dash. (See other Knowledge Base articles for explanations of each.)
A green dot with a white dash means the Apple operating system (OS X) is protecting you in a password field.