1. An optical blurring filter for intentionally blurring camera images, the filter comprising: a) a sheet of transparent plastic material; and b) a plurality of optical distortions formed in the transparent material, the optical distortions being formed so as to have substantially random point spread functions throughout the image, the point spread functions having a width and a shape which causes a predetermined degree of blurring; c) wherein placement of the transparent material in the optical path of a camera effects image blurring randomly so as to thwart attempts to digitally undo the blurring.