Method and apparatus for identifying electronic files
CA 2439596 C · Owner: Macrovision Corporation · Inventors: Ward, Bruce; Moore, James Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method and apparatus for identifying electronic files under test. According to the invention this process of identification , involves reading a master file including a master signal sequence dividing , the master signal sequence into segments generating a reference indicator , representing each master signal segment storing the respective reference , indicators as a master profile reading a test file including a test signal sequence, dividing the test signal sequence into segments generating , respective test indicators for successive segments of the test signal sequence to form a test profile, comparing the reference indicators and the test indicators …
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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 March 20, 2002 and granted September 13, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 20, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 2024.
- 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
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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.