Title:
COPY PROTECTION METHOD FOR OPTICAL DISK AND COPY-PROTECTED OPTICAL DISK
Document Type and Number:
Japanese Patent JP2005332567
Kind Code:
A
Abstract:
To provide a method for performing copy protection of an optical disk by applying a destructive data having a scarce DSV characteristic.
For encoding by using multi-codal codes, it is necessary for an encoder to select a data symbol which enables producing at least one destructive code word string. When a code word has a large DSV absolute value and a substitute code word is not present, when all code words are equal, or when all the substitute code words are against RLL rules, a possible code word to a data symbol is chosen.
Inventors:
BASILE CARMEN L
Application Number:
JP2005146089A
Publication Date:
December 02, 2005
Filing Date:
May 18, 2005
Export Citation:
Assignee:
MACROVISION EUROP LTD
International Classes:
G11B20/10; G11B20/00; G11B20/14; H03M5/14; (IPC1-7): G11B20/10; G11B20/14
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito