Information recording and reproducing apparatus, and...

Details Information recording and reproducing apparatus, and... Information recording and reproducing apparatus, and...

2008-05-13

2008-05-13

Miller, Brian E. (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

By medium defect indicative control signal

C369S053210

Reexamination Certificate

active

07372789

ABSTRACT:
When data is recorded on an optical disc capable of recording information only once, such as a DVD-R and the like, encrypted data obtained by encrypting the recording data and a key for decrypting the encrypted data are generated, and they are recorded in different areas on the recording medium. When the data recorded by the recording method is erased, only a key portion in a file including the key for decrypting the encrypted data is physically made a defect, or is registered as the defect by a defect management system. Thereby, since the key portion becomes unreadable, it becomes impossible that the recording data is restored by decrypting the encrypted data. Therefore, the recording data can be substantially completely erased.

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patent: 6469978 (2002-10-01), Ohata et al.
patent: 6621783 (2003-09-01), Murata
patent: 6834034 (2004-12-01), Yokokawa
patent: 62 59307 (1994-09-01), None
patent: 11-039801 (1999-02-01), None
patent: 2002-324383 (2002-11-01), None

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