AppSealing security module is launched along with the Sealed app and it stays running along with the app in the foreground instead of the background.
This was done to prevent the Android OS from killing the security module randomly for resource management purposes.
Android OS displays the app icon on the notification bar on all processes running in foreground.
The icons are displayed on Android OS version 4.1.x above and versions below are not displayed since icon display is not supported on those versions by Android.
Icon color in Android 5.0 Lollipop is limited to grey and white.
[Example of icon and message on Android 5.0.2]