So do I, but wish I didn't!
Is it possible to remove it does anyone know? I don't particularly mind it on the side windows but having it on the back one restricts the view of people following - sometimes it's useful to be able to see through the car in front.
If it is factory supplied privacy glass, nothing can be done with the exception for changing over the actual glass for non privacy glass.
If it has had a privacy film applied, it is reversible/removable (would suggest that such work is carried out by a professional).