发明名称 |
Anti-chipping recording disc, reading method and recording head |
摘要 |
An anti-piracy recording disk. The disk includes a main recording track which has interruptions or changes of turn. This gives rise to non-sequential reading and therefore to information which is difficult to access. The copying of such a disk by conventional means is very difficult making it possible to easily detect counterfeits or to render any copy unusable. |
申请公布号 |
AU9270198(A) |
申请公布日期 |
1999.04.23 |
申请号 |
AU19980092701 |
申请日期 |
1998.09.22 |
申请人 |
THOMSON CSF |
发明人 |
FRANCOIS-XAVIER PIROT;JEAN-CLAUDE LEHUREAU |
分类号 |
G11B7/007;G11B20/00;G11B23/28 |
主分类号 |
G11B7/007 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|