What is this shield icon that just appeared on my screen?

[AC Question]

A very tiny Blue shield icon just appeared on my screen - it doesn't seem to be related to any of my security apps that I know of. It isn't on the notification bar but just below it in the very left corner of my screen like a 5x5 pixel icon of a very tiny shield. It's weird, I can't click on it for do anything with it it's just sitting there. I have a screenshot but don't see any way to post that here. I'm using GO Launcher - is there a new feature with that perhaps that is causing this? Well I just answered that question I loaded my regular xperia home screen and it has the same shield icon on it. I just want to know what it is and possibly how to get rid of it if it serves no real purpose.

 

[B. Diddy]

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