Selective inactivation and copy-protection
CA 2428509 A1 · Owner: Hoang, Khoi · Inventors: Hoang, Khoi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention teaches a method for selectively preventing the access by a client to data-on-demand (DOD) services comprising the acts of: receiving at least one DOD service (706, 707), and receiving at least one associated expiration information packet corresponding to the at least one DOD service (704), wherein the at least one expiration information packet indicates a first predetermined time after which the at least one DOD service may no longer be accessed; and storing at least a portion of the at least one DOD service in memory location (708). In a second embodiment the method further comprises the act of receiving at least one associated copy protection information …
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 September 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 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.