Encrypted file retrieval method and device and computer-readable recording medium
CA 2357585 A1 · Owner: Nec Corporation · Inventors: Hamada, Tomohiro; Aoki, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An encrypted file is constituted by an assemblage of records having a plurality of items and at least key, items among the plurality of items that are keys in a retrieval are encrypted. The expansion means of a retrieval device decrypts at least key items of each record of the encrypted file, attaches identifiers that indicate which records the key items belong to and, expands the decrypted key items and identifiers in a work area of a main memory. A retrieval means retrieves from the work area key items that satisfy retrieval conditions that are applied by the user reads the, appropriate original records from the encrypted file if retrieval succeeds, decrypts the records and presents, them …
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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 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 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.