| 摘要 |
When data is output, output data may be embedded with management information including at least one of copy management information and reproduction management information. In such a case, a modification is applied to part of the management information embedded in the data to create new management information. The new management information is read from the data. The read new management information is statistically processed to identify this information. Based on an identification result, data recording or reproduction is controlled. For example, watermarks WM1, WM2, WM3, and so on are embedded in content data. With respect to only part of these watermarks, the copy management information is rewritten from "1, 0" (one-generation copy permission) to "1, 1" (copy inhibition). New watermarks are created as WM1', WM2', WM3', and so on, are embedded in the content, and are recorded on a medium.
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