Title:
DEVICE FOR PREVENTING DIGITAL DATA FROM BEING COPIED, COPYING PREVENTING METHOD, AND RECORDED MEDIUM ON WHICH DATA SUBJECTED TO COPYING PREVENTION IS RECORDED
Document Type and Number:
WIPO Patent Application WO/2001/086653
Kind Code:
A1
Abstract:
A method includes a step of acquiring original sound data streams by an input means and sending the acquired sound data streams to a data adding means, a step of specifying a data stream satisfying predetermined conditions among from the original data streams and superimposing guard data for changing the original sound data when reproduced after compressed and emphasizing data for emphasizing the change by the guard data, on the specified data, a step of recording the original data streams on which the guard data and the emphasized data are superimposed on a predetermined recording medium by an output means. The original data stream are changed by the guard date and the emphasized date to distort the reproduced sound when the compressed data is reproduced.
Inventors:
SATO YASUTAKA (JP)
Application Number:
PCT/JP2000/003032
Publication Date:
November 15, 2001
Filing Date:
May 11, 2000
Export Citation:
Assignee:
EMDES CO LTD (JP)
SATO YASUTAKA (JP)
SATO YASUTAKA (JP)
International Classes:
G11B20/00; G11B20/10; (IPC1-7): G11B20/10
Foreign References:
| JPH10289522A | 1998-10-27 | |||
| JPH10162501A | 1998-06-19 | |||
| JPH11232777A | 1999-08-27 |
Attorney, Agent or Firm:
Muramatsu, Yoshihito (4th Floor 22-7, Shiba 3-chome Minato-ku Tokyo, JP)
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