A method of and system for precluding a copyrighted work from being played in an unauthorized manner
CA 2429112 A1 · Owner: Kerber, Thomas · Inventors: Kerber, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of precluding a copyrighted work from being played in an unauthorized manner comprises encoding the work so as to disable it from playing in conventional players; distributing the encoded work; configuring a decoding player to accept the encoded work and to play the encoded work according to a time based key code, such that the encoded work is playable only when permitted by the time based key code; providing a decoding algorithm for decoding the encoded work; receiving a request for a time based key code; and providing the time based key code to the decoding player such that, subsequent to the time based key code being received by the decoding player and subsequent to the, work …
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 May 20, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 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.