摘要 |
A reproduction program is installed in a PC, and then a ripping key of a CD is provided from, e.g. an FD. By using the ripping key, the music contents in the CD can be copied to a PD, but music contents cannot be downloaded from an EMD server and copied to a PD. If the music contents distributed from an EMD server is stored in a PD, a key for EMD different from the ripping key is acquired through a network and the reproduction program is executed. Thus, the security of the contents data distributed through a network is enhanced.
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申请人 |
SONY CORPORATION;ISHIGURO, RYUJI;KAWAKAMI, ITARU;TANABE, MITSURU;EZURA, YUICHI;SATO, ICHIRO;EBIHARA, MUNETAKE |
发明人 |
ISHIGURO, RYUJI;KAWAKAMI, ITARU;TANABE, MITSURU;EZURA, YUICHI;SATO, ICHIRO;EBIHARA, MUNETAKE |