Owner Bayer Innovation GmbH

Inventors Erdei, Gabor; Szarvas, Gabor; Koppa, Pal; Toth, Peter; Ujvari, Tamas; Domjan, Laszlo

Agent Davies Collison Cave

Pub. Number AU-B-2002335994

PCT Number PCT/HU02/00104

PCT Pub. Number WO2003/032300

Priority P0104183 09.10.01 HU

Filing date 9 October 2002

Wipo publication date 22 April 2003

Acceptance publication date 17 January 2008

G11B 7/24 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power - Record carriers characterised by the selection of the material or by the structure or form

G06F 12/14 (2006.01) Accessing, addressing or allocating within memory systems or architectures - Protection against unauthorised use of memory

G09C 5/00 (2006.01) Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages

G11B 7/004 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power

G11B 7/0065 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power

G11B 7/007 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power - Arrangement of the information on the record carrier, e.g. form of tracks

G11B 7/135 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power - Means for guiding the beam from source to record carrier or from record carrier to detector

G11B 11/00 (2006.01) Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group

G11B 20/00 (2006.01) Signal processing not specific to the method of recording or reproducing

G11B 20/10 (2006.01) Signal processing not specific to the method of recording or reproducing - Digital recording or reproducing

G11B 23/28 (2006.01) Record carriers not specific to the method of recording or reproducing - indicating prior or unauthorised use