In a reproduction apparatus, for reproducing an original signal conveyed as main data by a data medium such as a recording disk or broadcasting system, with medium protection data which are specific to the data medium being conveyed together with the main data, the apparatus includes a section for generating...http://www.google.de/patents/US6763065?utm_source=gb-gplus-sharePatent US6763065 - Reproduction protection method according to both medium and apparatus protection data and a medium therefor
