发明名称 |
RECORDING MEDIUM, RECORDING APPARATUS, READING APPARATUS, AND PROGRAM AND METHOD THEREFORE |
摘要 |
An MPEG2-PS format digital stream is composed of VOBUs and each VOBU except an RDI-Pack at the top is encrypted using a content key Kc. The content key Kc is an encryption key obtained by adding a title key Kt to CCI, and then converting a time varying coefficient using the sum. Accordingly, the resulting content key Kc differs for each VOBU. Since each content key Kc is all different for such a small unit of VOBU, copyright of the digital stream is firmly protected. CCI contained in RDI-Pack represents conditional Copy Freely status which allows the digital stream to be copied on condition that the digital stream is recorded only in encrypted form. |
申请公布号 |
PL372464(A1) |
申请公布日期 |
2005.07.25 |
申请号 |
PL20030372464 |
申请日期 |
2003.03.25 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO,LTD. |
发明人 |
NAGAI TAKAHIRO;MURASE KAORU;ISHIHARA HIDESHI |
分类号 |
G11B20/00;H04N5/765;H04N5/775;H04N5/781;H04N5/85;H04N5/913;H04N7/24;H04N9/79;H04N9/804 |
主分类号 |
G11B20/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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