External security module for a television signal decoder
CA 2049310 C · Owner: Gammie, Keith Beverly · Inventors: Gammie, Keith Beverly
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A decoder for descrambling encoded satellite transmissions comprises an internal security element (1019) and a replaceable security module (1014). The program signal (SYS) is scrambled with a key (KOMI) and then the key itself is twice-encrypted and multiplexed with the scrambled program signal. The key (KOMl) is first encrypted with a first secrete serial number (SSN1) which is assigned to a given replaceable security module (1014). The key is then encrypted with a second secret serial number (SSN0) which is assigned to a given internal security element (1019). The internal security element (1019) performs a first key decryption using the second secret serial number (SSN0) stored …
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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 January 30, 1991 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2013.
- 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.