发明名称 |
Data nullification device for nullifying digital content recorded on a recording medium, after the digital content has been reproduced, a predetermined time period has passed since the recording of the digital content, or the digital content has been moved to another recording medium |
摘要 |
A data nullification device for nullifying target data recorded on a recording medium is provided. The target data is made up of a plurality of data blocks. A judging unit judges, in units of data blocks, whether the target data needs to be nullified. A nullifying unit nullifies, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks. |
申请公布号 |
US2002126843(A1) |
申请公布日期 |
2002.09.12 |
申请号 |
US20020066725 |
申请日期 |
2002.02.06 |
申请人 |
MURASE KAORU;MOTOHASHI YOSHIHIKO;MIYAZAKI MASAYA;ITO YOSHIKATSU |
发明人 |
MURASE KAORU;MOTOHASHI YOSHIHIKO;MIYAZAKI MASAYA;ITO YOSHIKATSU |
分类号 |
G06F12/14;G06F21/10;G06F21/24;G06F21/60;G06F21/62;G06Q50/00;G06Q50/10;G11B20/00;G11B20/10;H04L9/08;H04N5/765;H04N5/781;H04N5/85;H04N5/91;H04N7/16;(IPC1-7):H04L9/00 |
主分类号 |
G06F12/14 |
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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