发明名称 |
ANTI-CHIPPING RECORDING DISC, READING METHOD AND RECORDING HEAD |
摘要 |
The invention concerns a data recording disc comprising a main recording track including one ore several breaks and/or groove changes, which gives rise to a non-sequential reading thereby making such data hardly accessible. A hard copy of such a disc becomes extremely difficult, thereby enabling the detection of counterfeits by data detection and making any copy useless. |
申请公布号 |
WO9917281(A1) |
申请公布日期 |
1999.04.08 |
申请号 |
WO1998FR02034 |
申请日期 |
1998.09.22 |
申请人 |
THOMSON-CSF;PIROT, FRANCOIS-XAVIER;LEHUREAU, JEAN-CLAUDE |
发明人 |
PIROT, FRANCOIS-XAVIER;LEHUREAU, JEAN-CLAUDE |
分类号 |
G11B7/007;G11B20/00;G11B23/28 |
主分类号 |
G11B7/007 |
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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