There is described the use of a transparent film comprising a non-fibrous substrate layer of regenerated cellulose in the manufacture of a security article exhibiting printed information, wherein said transparent film is the material on which printed information and optionally one or more other security feature(s) is disposed, and wherein said transparent film exhibits one or more, and preferably all, of the following properties: haze of no more than 10%, preferably no more than 5%, preferably no more than 4%, preferably no more than 2.5%; birefringence of from about 400 to about 800 nm; a surface energy of at least about 38 dynes, preferably at least about 40 dynes, preferably at least about 42 dynes, and preferably no more than from about 60 dynes; and a water vapour permeability in the range of from about 20 to about 40, preferably from about 25 to about 35, preferably from about 28 to about 32 g/m2/24 hours at 25° C. and 75% relative humidity, and/or in the range of from about 110 to about 130, preferably from about 115 to about 125, preferably from about 118 to about 122 g/m2/24 hours at 38° C. and 90% relative humidity.