FORFARANDE FOR SKYDD AV LJUDBERARE OCH DERAS ETIKETTER OCH/ELLER FORPACKNING MOT EFTERBILDNING

摘要

For the purpose of marking, the sound recording carriers are provided with data. In order to distinguish the imitations from the originals, the data carriers are marked with second data which have with the first data a relationship not recognizable by unauthorized persons. For carrying out such process, a marking device comprising a coding device for coding characteristic data (13) into a distinctive mark (14) and the control of a recording apparatus intended to the application of the distinctive mark.