Secure Input Warning

Can anyone point me to the right preference pane to disable the following notice, which appears top left by the Apple menu.

Secure Input is enabled. Open Preferences to hide this warning.

I’d include a screen shot, but apparently it’s do super secret that you can’t grab one!

Do you have 1Password 8 installed?

1Password keeps Secure Input stuck! - Software - MPU Talk

What program(s) are giving you a problem? For some like TextExpander, which is a key logger, this is a known problem.

Yes, it’s only appeared since then.