Device and method for signing, marking and authenticating computer programs
CA 2446291 A1 · Owner: Cousot, Patrick · Inventors: Cousot, Patrick; Riguidel, Michel; Venet, Arnaud
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a product/program and method that can be used to insert into a software program watermarks in source code particularly Java, which respect the semantics of the program and which are very difficult to detect. Said invention can be used to: calculate a secret semantic signature of a computer software or hardware program from among an infinite number of possible secret semantic signatures; mark a computer software or hardware program by inserting a visible or invisible mark by means of watermarking that can be used to find an authenticator of the original program; find the mark and extract said authenticator using the secret semantic signature of the watermarked …
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 April 23, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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
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.