Marking of electronic documents in order to expose unauthorized publication
CA 2267164 A1 · Owner: Nokia Telecommunications Oy · Inventors: Hippelainen, Lassi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of marking information to be produced in order to expose unauthorized copying. In the method, a user identifier (12a) is defined a source file (10) , containing a substantial part of the information produced is created and a , different target file (17) is created for each user on the basis of the source file (10) and the user identifier (12a). In the invention several predefined , modification rules (10b1-10b3 31, 32) are stored in a file (10, 10b, 16) in order to modify the information contained in the source file (10). Using a digital processor, a sequence of modification keys (15a 15b,...) is generated , on the basis of the user identifier the locations of the source file …
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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 September 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 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.