Method and system for detecting unauthorized utilization of a cable television decoder
CA 2256286 C · Owner: Cottam, John L. · Inventors: Cottam, John L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and system are disclosed for detecting unauthorized utilization of a cable television decoder. The decoder is utilized to receive cable television signals. The decoder is one of a plurality of receivers of different types. A local oscillator frequency being utilized by the decoder to receive the channel is determined. A type is then determined for the decoder utilizing the determined local oscillator frequency. The channel being received is also determined utilizing the determined local oscillator frequency. In response to the determination of type of decoder and channel being received, a determination is made whether receipt of the channel is authorized for this decoder.
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 December 17, 1998 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2020.
- 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.