Image scrambling method and apparatus therefor
CA 2268762 C · Owner: Tanaka, Kazuyoshi · Inventors: Tanaka, Kazuyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an image scrambling method and apparatus. The apparatus comprises a first dividing decoder for dividing the MPEG encoded image data stream into a plurality of data segments (for example macro blocks or slices); at least one arrangement table recording arrangement information to be used for arranging the data segments; an arrangement circuit for arranging the data segments output from the first dividing decoder in accordance with the information recorded in the arrangement table to output a scrambled image data stream; a second dividing decoder for dividing the scrambled image data stream into a plurality of data segments; at least one rearrangement table …
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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 April 7, 1999 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 7, 2021.
- 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.