System and method for securing on-demand delivery of pre-encrypted content using ecm suppression
CA 2382701 A1 · Owner: So, Nicol Chung Pang · Inventors: So, Nicol Chung Pang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A video-on-demand service is facilitated by encrypting before purchase , requests by subscribers content such as a movie in accordance with one or a series of control words protected by a program key. The transport mechanism for delivery is an MPEG compliant transport mechanism and the program key is , encrypted and contained in an entitlement control message (ECM). The ECMs are transmitted to the set-top terminal associated with the subscriber for a limited time defining a service acquisition window. Thereafter transmission , of some or all ECMs are suppressed. This reduces the likelihood that an unauthorized terminal will intercept the ECM containing the program key which , is needed …
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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 August 24, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 24, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 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.