The invention is directed to a source device and a method for encrypting digital contents at the source device. The composite material includes two materials, a transparent bulk optical material and radiation absorbing or reflecting fibers embedded within the bulk material. A modifier may be applied to one of the symbols displayed on one of the soft keys by selecting the soft key and then providing a directional input. The duration of each reference pulse is measured when measuring consistency. The method may also include presenting the converted support ticket to a user at the management station. The information processing device detects an external device located near the information processing device in S1, and when multiple windows are displayed having an overlapping portion the information processing device identifies an external device associated with the multiple windows in S6.