Systems and methods for optical media modification
CA 2434538 A1 · Owner: Sca Ipla Holdings Inc. · Inventors: Hart, John J. Iii; Lee, Andrew R.; Levine, Richard B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention involves the modification of optical media (63,69,72) such that selected portions (57-62,64-68) of the media are physically altered in order to distort and/or attenuate the transmission of such optical signal to a predetermined degree. This slows the copying process to a desired extent by creating media that generates measurable changes in the system's timing and performance related to how and when data is read in standard optical media rives copying devices, in a fashion that makes the process of copying the media more time consuming and difficult as a deterrent to any such copying. , The present invention can create instances of optical media that have uniquely …
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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 December 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 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.