Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-05-10
2005-05-10
Ometz, David L. (Department: 2655)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S275400, C369S047210, C369S047190
Reexamination Certificate
active
06891788
ABSTRACT:
An optical disk is provided for recording data of a signal modulated according to a predetermined modulation method in a form of concavo-convex pits. The optical disk includes a first area having a reflecting film partly removed, and a second area for recording pits which are different from pits satisfying requirements of the predetermined modulation method. The first area having the reflecting film partly removed includes a portion which is formed by removing the reflecting film, and has a length longer than a maximum pit length determined by the modulation method in a circumferential direction of the optical disk. When the pits recorded on the optical disk are physically copied as they are, physical copying of the optical disk can be prevented by utilizing such a difference that the authorized optical disk differs from a pirated copy in a combination of the respective reproduced signals of the first and second areas.
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Morioka Koichi
Moriya Mitsuro
Nishioka Akihiko
Oshima Mitsuaki
Takizawa Teruyuki
Matsushita Electric - Industrial Co., Ltd.
Ometz David L.
Ortiz Criado J. L.
Wenderoth , Lind & Ponack, L.L.P.
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