Content replication deterrent method on optical discs
CA 2467642 A1 · Owner: Goyette, Donald R. · Inventors: Gerger, Scott; Selinfreund, Richard H.; Vig, Rakesh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention includes both methods for authenticating optical storage media and methods for providing means for authenticating optical storage media actually on the optical recording medium. One of the methods for providing authentication means metalizes a portion of the optical recording medium (36) followed by spin coating the previously uncoated portion of the recording medium with an optical state changing security material (34) followed by , overcoating this with a reflective layer (34). Correctable or uncorrectable errors may be placed in predetermined areas of the medium and the presence of these detected to authenticate the optical recording medium and distinguish it from an …
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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 April 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2025.
- 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.