| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for protecting profits of a copyright holder by preventing numberless recording media from being copied without restrictions, when copying is restricted, such as "Copy One Generation". <P>SOLUTION: When digital information is output to an external device connected to a plurality of output circuits (315A, 315B, 72A-72D), a control circuit (311, 73) restricts the number of times of performing authentication with the external device, so that the total number of external devices, to which copy-restricted digital information is output, is restricted to be within a prescribed number. <P>COPYRIGHT: (C)2010,JPO&INPIT |
