| 摘要 |
<p>Content data is moved from a first recording medium to a second recording medium, the first recording medium recording an encrypted content (Enc-content) (key is first key (Kt)), a first encrypted key (E-Kt) (key is a fourth key (Kmum) which is generated from a second key (Kmv) and a third key (Kmu)), and a second encrypted key (E-Kmv) (key is the third key (Kmu)). The method comprises decrypting the encrypted content (Enc-content) and the second encrypted key (E-Kmv) which are read from the first recording medium to obtain the plain content and the second key; transmitting the plain content and the second key to the second recording medium; and deleting the second encrypted key (E-Kmv) from the first recording medium.
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