Copy-protected optical disc and method for protecting same
CA 2398701 A1 · Owner: Pirot, Francois-Xavier · Inventors: Des Rieux, Marc; Le Carvennec, Francois; Pirot, Francois-Xavier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a copy-protected disc and a method for protecting such a disc. The disc comprises a main spiral track (1) and a secondary track (2) interposed partly between the turns of the main track. The sectors of the secondary track and those opposite the main track bear the same addresses (A to A+Q) and comprise a characteristic identifier of the track where they are located. The inventive method consists in identifying said structure by a series of readings of the sectors of the protective zone (A to A+Q) starting from the addresses respectively before and after said zone. The invention is applicable to discs such as CD-ROM or DVD-ROM protected against piracy.
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 6, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 6, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 2023.
- 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.