Apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers for sound recording discs, namely, blank magnetic data carriers; sound recording discs, namely, blank record discs; blank optical discs; blank audio-video discs; recorded discs, namely, audio discs featuring music, video discs featuring music; cash registers; calculating machines; information treatment apparatus, namely, electronic agendas; computers; computer operating programs, recorded; downloa...