Information processing device and method, and program storage medium
CA 2328932 C · Owner: Tanabe, Mitsuru · Inventors: Kawakami, Itaru; Ishiguro, Ryuji; Tanabe, Mitsuru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The CPU 11 of the personal computer 1 controls the CPU 32 of the adaptor 26 made of a semiconductor IC to compute a hash value of a content-managing music data base recorded in the HDD 21 and store it into the nonvolatile memory 34. When , playing back a content recorded in the HDD 21 the CPU 11 computes the hash , value , of the music data base recorded in the HDD 21 compares it with hash values , stored cumulatively in the nonvolatile memory 34 and controls the playback of the , content from the HDD 21 based on the result of the comparison.
Read the whole patent
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 17, 2000 and granted April 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2022.
- 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.