Apparatus and method for issuing and authenticating securities, etc. using digital watermarking
US7457957B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2002 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Oct 7, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3271
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Simultaneously with a robust watermark and fragile watermark or semi-watermark is embedded into conventional securities, etc., such as gift coupon, various kinds of ticket, coupon, electronic stamp, bond & debenture, note, stock certificate, lottery, paper money, check, etc. and various kinds of public documents including certificates, etc. requiring confirmation and authentication (hereinafter, referred to as “securities, etc.”) in the form of digital file. Such watermark-embedded securities, etc. are conveniently issued on-line and are printed out in the form of paper through a printer. The printed securities, etc. are used off-line and are authenticated by determining the forgery or alternation by means of photocopy, etc. through the detection of the embedded watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.