1. Packaging material with a forgery-proof security feature, whereby the security feature comprises a coded image arrangement ( 2 ) which is provided on the packaging material and which reveals an image or image sequence by superimposing a related decoder element ( 4 ), characterised in that, the decoder element ( 4 ) is a transparent or translucent, film-type object with a line or column-type pattern ( 5 ) made up of lines or columns lined up parallel to each other specific distances apart, and the image arrangement ( 2 ) on the packaging material contains a plurality of coded individual images that mix into each other, whereby the coded individual image is an arrangement of strip-shaped image elements ( 3 ) that are spaced apart and are co-ordinated in terms of orientation and distance from each other with respect to the line or column pattern ( 5 ) of the decoder element ( 4 ), such that by overlapping the image arrangement ( 2 ) and the decoder element ( 4 ) and lateral displacement of the decoder element ( 4 ) over the image arrangement ( 2 ), an image sequence that to the human eye appears to be moving is obtained in that, depending on the position of the decoder element ( 4 ), the coded individual images are covered by the line or column pattern ( 5 ) or are visible by means of the window regions lying between the lines or columns and, in combination with the line or column-type pattern ( 5 ) of the decoder element ( 4 ), fit together to make up recognisable individual images ( 7 a - f ).