| 摘要 |
PROBLEM TO BE SOLVED: To correctly manage content data much more surely. SOLUTION: In a portable reproduction device 3, music data writing or erasing processing is carried out by a personal computer 4, a music management database is updated by the personal computer 4, and then, for example, a reproduction number-of-times database is updated when isolation of the personal computer 4 is recognized. Thus, alteration of the reproduction number-of-times database by the personal computer 4 is prevented. Even when the personal computer 4 manages a plurality of portable reproduction devices 3, grouping of a reproduction number-of-times database is carried out for each portable reproduction device 3. COPYRIGHT: (C)2009,JPO&INPIT
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