violet icons in outliner

I imported a model from MakeHuman to Blender. All objects are marked with violet colored bacgrounds in outliner window. I cannot change visibility or renderability in outliner - as soon as I hit Render, settings will go back to original positions.
What does that violet color mean?

Is it secret?

It means it is controlled by a driver. This is probably a makehuman import. They do really weird things

Thanks! Can you please enlight me where do I turn off that thing to use as a normal object?

RMB on the icon and select Delete Driver