Icon on Sansa Fuze Screen Not Described in Manual

There is a small green circle with a dot in the center in the lower right hand corner of my Sansa Fuze Screen.

I have the Sansa Fuze User Manual, but pages 8 and 9 describing the screen don’t describe this icon. 

The circle appears in the location where “Charging” lightning bolt would appear.

The firmware is version 02.02.26A.

That means you have DRM’d tracks on your player, and the green color indicates that the license status is good. As the licenses get closer to expiring, the circle will change to yellow, then red. To renew the licenses, you need to syncronize the Fuze with whatever service the tracks came from.