05650991 is referenced by 36 patents and cites 15 patents.

A magneto-optical disc 1 has a TOC area in which the cumulative recordable data volume or the cumulative recordable time is preformatted, and a user TOC area in which the cumulative recorded data volume or the cumulative recorded time is preformatted. When recording audio data, a system controller 17 restricts the volume of recording data or the recording time based on the cumulative recordable data volume, the cumulative recordable time, cumulative recorded data volume, the cumulative recorded time or the data compression factor, while causing an updated cumulative recorded data or an updated cumulative recorded time to be recorded. Restrictions of the recording may be performed based on the cumulative recorded data volume or the cumulative recorded time. A prepaid system may be realized by charging the fee conforming to the cumulative recordable data volume or the cumulative recordable time at the time of sale of the disc.

Title
Magneto-optical disc having preformatted information to prevent unauthorized data duplication
Application Number
7/869366
Publication Number
5650991
Application Date
April 14, 1992
Publication Date
July 22, 1997
Inventor
Kazuhiko Fujiie
Tokyo
JP
Agent
Limbach & Limbach L
Assignee
Sony Corporation
JP
IPC
G11B 15/04
G11B 7/24
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