Selective and renewable encryption for secure distribution of video on-demand
CA 2674148 C · Owner: Diva Systems Corporation · Inventors: Son, Yong Ho; Goode, Christopher; Colligan, Michael Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Selective encryption is provided in a process which includes: determining whether a predetermined criterion is satisfied; setting a selective encryption status field (1402) if the predetermined criterion is satisfied; and encrypting an unencrypted payload to generate an encrypted payload and constructing a packet with the encrypted payload (1406) if the predetermined criterion is satisfied. The predetermined criterion may be one of several criteria each of which reduce the required amount of encryption and decryption while maintaining a high level of security. Renewable encryption is provided in a process which includes: copying a first encrypted digital video program from a remote server …
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 April 5, 2000 and granted June 5, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2022.
- 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.