Data control method, data control information embedding method, a data control information detection method, data control information embedding apparatus, recording device and data control information detecting device

摘要

PROBLEM TO BE SOLVED: To control copying propriety and the number of copying times and to protect a copyright by embedding prohibition information into data, such as videos and voices. SOLUTION: The prohibition information 31 is embedded into the videos and permission information 32 is embedded therein by using digital signature, etc., if N times of copying is okay. At the time of reproduction of the data, the presence or absence of the permission information 32 is investigated and a permission flag is set at a 1 or 0. If the permission flag is 1, the permission information 32 is deleted and the copying of the data is made possible. If the permission flag is 0, the prohibition information 31 is detected. A prohibition flag is then made 1 or 0. If the prohibition flag is 1, a copying okay or denial flag is set at the 0 and the copying of the data is prohibited.