System for securely delivering pre-encrypted content on demand with access control
CA 2435316 A1 · Owner: On-Yee Chen, Annie · Inventors: Okimoto, John I.; On-Yee Chen, Annie; Tang, Lawrence W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of delivering content from a head end to subscriber terminals within one or more cable systems. Such content may be video audio or the like. The , method includes the step of encrypting the content offline to form preencrypted content, generating an encryption record containing parameters employed for encrypting the content. Based on the encryption record a control , message for permitting access to the pre-encrypted content is generated using a periodical key provided by the first cable system. The pre-encrypted content and associated control message is thereafter forwarded to the first subscriber terminal for decryption of the content. For a second subscriber terminal …
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 January 14, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 14, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2024.
- 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.