Data hiding and extraction methods
CA 2230071 A1 · Owner: Morimoto, Norishige · Inventors: Shimizu, Shuichi; Morimoto, Norishige; Numao, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A data hiding method for hiding message data in media data and a data extracting method for extracting message data hidden in the media data. In the data hiding method, the message data are dispersedly hidden in the media data so that no third person can alter the message data. Specifically the array , elements of a message array are dispersedly hidden in a media array based on a status value S designating a specific array element in the media array when the media data and message data are expressed as the media array and the message array, respectively. The hiding method includes (a) a step of determining the j-th (j0) status value Sj (b) a step of determining the (j+1)-, th status …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 13, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.