An optical disc apparatus configured to credibly prevent unauthorized use of hybrid optical discs by determining by a prevention means whether a hybrid optical disc is legitimate not only during information reading but also during recording process. The prevention means includes reading process determination means for examining whether the hybrid optical disc is legitimate during a reading process of information recorded in the ROM area. The determination means is also configured to determine whether the hybrid optical disc is legitimate during the process of recording information, as well. In another aspect, the prevention means includes read information determination means and record information determination means utilizing information that is retrievable when information recorded in advance in the ROM area is read and when information is recorded in the recordable area, respectively, so as to be able to determine more credibly that a hybrid optical disc is legitimate.