EP 1076902 A2 20010221 - DIGITAL OPTICAL MEDIA AUTHENTICATION AND COPY PROTECTION METHOD
Title (en)
DIGITAL OPTICAL MEDIA AUTHENTICATION AND COPY PROTECTION METHOD
Title (de)
DIGITALE OPTISCHE MEDIA-AUTHENTIFIZIERUNG UDN KOPIESCHUTZVERFAHREN
Title (fr)
AUTHENTIFICATION DE SUPPORTS OPTIQUES NUMERIQUES ET PROTECTION CONTRE LES COPIES
Publication
Application
Priority
- IL 9700266 W 19970805
- US 68920996 A 19960805
- US 3808097 P 19970306
Abstract (en)
[origin: WO9808180A2] Novel digital optical media has recorded thereon certain symbols belonging to two classes of non-standard codes in precise predetermined locations. One class provides symbols which, when read many times by a standard optical media reader, are decoded as valid but having variable values. A second class embodies codes which are immediately recognized by the player's decoder as invalid. The first class of non-standard codes can be read by a standard optical media reader but cannot be written or reproduced by standard optical media recorders and mastering equipment, and its presence on optical media thereby serves to identify the optical media as authentic, as opposed to an unauthorized copy, which will lack these special symbols. Symbols belonging to the second class of non-standard codes serve to protect the reading of symbols belonging to the first class from being altered or stabilized by the error-correcting system of the player. Patterns combining symbols of these two classes provide a non-copyable mark for automatically verifying the authenticity of optical media and protecting the data recorded thereon from being usable except when present on authentic media.
IPC 1-7
G11B 17/22; G11B 5/09; G11B 15/52; G11B 20/10; G11B 27/22; G11B 20/12; H04N 5/76; A63H 3/33
IPC 8 full level
G06K 7/14 (2006.01); G06K 19/06 (2006.01); G11B 20/00 (2006.01); G11B 20/14 (2006.01); G11B 20/18 (2006.01); H03M 13/00 (2006.01); H03M 13/35 (2006.01)
CPC (source: EP)
G06K 7/14 (2013.01); G06K 7/1465 (2013.01); G06K 19/06009 (2013.01); G11B 20/00086 (2013.01); G11B 20/00123 (2013.01); G11B 20/0021 (2013.01); G11B 20/00579 (2013.01); G11B 20/00586 (2013.01); G11B 20/00927 (2013.01); G11B 20/1426 (2013.01); G11B 20/18 (2013.01); H03M 13/00 (2013.01); H03M 13/35 (2013.01); G11B 20/1833 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB IE IT LI LU NL SE
DOCDB simple family (publication)
WO 9808180 A2 19980226; WO 9808180 A3 19980820; AU 3706197 A 19980306; EP 1076902 A2 20010221; EP 1076902 A4 20010523; IL 128369 A0 20000131
DOCDB simple family (application)
IL 9700266 W 19970805; AU 3706197 A 19970805; EP 97933829 A 19970805; IL 12836997 A 19970805