added contents data also include a jump destination address code word for every cell which indicates the type of a jump by which the related cell can be returned to its correct position in the original playback order the stored watermark added contents data further include copyright information the jump destination address code words and the copyright information compose watermark information at an initial stage of operation of the apparatus in fig1 the data reader 121 reads out the first cell of the watermark added contents data from the recording medium 117 the data reader 121 feeds the first cell of the watermark added contents data to the mpeg decoder 122 and the watermark detecting device 123 the mpeg decoder 122 subjects the first cell of the watermark added contents data to an mpeg decoding procedure thereby reproducing a video signal and an audio signal the mpeg decoder 122 feeds the reproduced video signal to the display 124 the reproduced video signal is indicated on the display 124 preferably the watermark information is designed to be substantially invisible when being indicated on the display 124 the mpeg decoder 122 feeds the reproduced audio signal to the loudspeaker 128 the reproduced audio signal is converted into corresponding sounds by the loudspeaker 128 on the other hand the watermark detecting device 123 extracts the watermark information from the first cell of the watermark added contents data the extracted watermark information includes the jump destination address code word relating to the first cell the watermark detecting device 123 feeds the jump destination address code word to the.