Method for data security in a digital telecommunication system
CA 2126963 A1 · Owner: Siemens Aktiengesellschaft · Inventors: Mohrmann, Karl-Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For data security in a pay-TV system a public key is, respectively calculated from a secret key prescribed for pay-TV receiver by A program purveyor. This public key is utilized in the program distribution center for encoding secondary key information for matching the pay-TV receiver to transmission modalities that are repeatedly modified and that are provided for the pay-TV receiver in the program distribution center. The program purveyor can prescribe new keys from time to time. The initial settings of scramblers and descramblers can be modified as transmission modalities.
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 June 28, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2016.
- 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.