Recording/reproducing metod and recorder/reproducer for record medium containing copyright management data

摘要

There is provided a method of recording data to a recording medium. For recording data to the recording medium by a recorder, it is judged whether a terminal unit with a memory having user identification information recorded therein is connected. When the terminal unit is found connected, an encryption key is exchanged between the recorder and terminal unit, user identification information read from the memory is encrypted with the exchanged encryption key, sent from the terminal unit to the recorder, and recorded to the recording medium based on the user identification information sent from the terminal unit.