Abstract: A card display and retention device includes a sheet having a height and width as well as front and back surfaces. Edges spanning the height and width of the sheet frame the front surface of the sheet. A demarcation along the width of the sheet, divides the sheet into first and second portions. The first portion can be folded to form a tab for installation of the card holder in a binder having a pocket. The second portion has at least one slit for insertion of a card therein. When a card is inserted into the holder, information on a face of the card can be displayed while allowing for the card to be secured to a binder or other surface.

Abstract: An optical disc having machine-readable, information encoding features includes a coating comprising a tellurapyrylium dye irreversibly bleachable by light. The dye, once bleached, is operative to change the index of refraction of the dye to inhibit reading of the information encoding features.