EP 1282894 A2 20030212 - METHOD FOR INTEGRATING HIDDEN INFORMATION IN A SET OF NOTES
Title (en)
METHOD FOR INTEGRATING HIDDEN INFORMATION IN A SET OF NOTES
Title (de)
VERFAHREN ZUM EINBRINGEN VERBORGENER INFORMATION IN EINEN NOTENSATZ
Title (fr)
PROCEDE DESTINE A INTEGRER DES INFORMATIONS CACHEES DANS UNE SUITE DE NOTES
Publication
Application
Priority
- DE 0101333 W 20010404
- DE 10023759 A 20000515
Abstract (en)
[origin: WO0188899A2] The invention relates to a method for integrating hidden information in a set of notes. According to the method, the geometrical shape and/or the mutual geometrical proportion of geometrical elements of the set of notes are modified relatively to the original version, based on a predetermined key, so that the modifications carry the information to be integrated in digital form and do not reduce the readability of the set of notes. The inventive method allows especially for the integration of an identification marking in a set of notes and the retention of said marking when the set of notes is subjected to copying or to simple manipulations.
IPC 1-7
IPC 8 full level
H04N 1/387 (2006.01); G09C 5/00 (2006.01); G10H 1/00 (2006.01)
CPC (source: EP US)
G10H 1/00 (2013.01 - EP US); G10H 2210/086 (2013.01 - EP US); G10H 2240/041 (2013.01 - EP US); G10H 2240/195 (2013.01 - EP US); G10H 2250/211 (2013.01 - EP US)
Citation (search report)
See references of WO 0188899A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0188899 A2 20011122; WO 0188899 A3 20020627; CA 2405948 A1 20021009; DE 10023759 A1 20011122; EP 1282894 A2 20030212; JP 2003533919 A 20031111; US 2003116627 A1 20030626
DOCDB simple family (application)
DE 0101333 W 20010404; CA 2405948 A 20010404; DE 10023759 A 20000515; EP 01931413 A 20010404; JP 2001584411 A 20010404; US 27606402 A 20021112