Method and apparatus for incremental code signing
CA 2632076 C · Owner: Apple Inc. · Inventors: Kiehtreiber, Perry; Brouwer, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention discloses a method for quickly and easily authenticating large computer program. The system operates by first sealing the computer program with digital signature in an incremental manner. Specifically the computer program is divided into a set of pages and a hash value is calculated for each page. The set of hash values is formed into a hash value array and then the hash value array is then sealed with a digital signature. The computer program is then distributed along with the hash value array and the digital signature. To authenticate the computer program a recipient first verifies the authenticity of the hash value array with the digital signature and a public key. …
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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 10, 2004 and granted September 8, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 10, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2026.
- 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.