Data delivery method and data delivery system
CA 2366161 A1 · Owner: Kamiya, Shigeki · Inventors: Yamashita, Masami; Kamiya, Shigeki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A data delivery system highly resistant to misappropriation of data. A plurality of, pieces of key information are generated on the basis of an encryption key specific to each, digital data item to be delivered. The multiple pieces of key information are delivered over, routes which differ from the routes used to deliver the digital data and which further differ, from each other. Physically different media or transmission over a network at different times, are used to transmit the different sets of key information separately. A downstream system, includes a decryption server that uses the recovered encryption key to decrypt the delivered, digital data. If the digital data is …
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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 December 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2023.
- 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.