These terms are used to describe how many colours
are printed on a piece of paper. A 4/1 piece is printed in four
colours on one side (ie full colour), and one colour on the back
(usually black). 4/4 means full colour on both sides. 4/0 means
full colour on one side, and no printing on the back. 1/1 means
one colour (again, usually black) on both sides.
A plastic clam-shell type case designed for DVD
discs to differentiate them from CD’s and protect them. It
is similar to clam-shell cases used for VHS cassette, but it is
wider and thinner.