Encryption/decryption of program data but not psi data
CA 2856945 C · Owner: Zenith Electronics Corporation · Inventors: Turner, Rudolf; Lewis, Richard; Hauge, Raymond C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a transmitter, data is encrypted by use of a data key the data key is encrypted based on a first modification key and the first modification key is encrypted based on a second modification key such that the first and second modification keys are different keys. The encrypted data the encrypted data key, and the encrypted first modification key are transmitted to a receiver. In the receiver the encrypted first modification key, the encrypted data key and the encrypted data are received from the transmitter. The encrypted first modification key is decrypted based on the second modification key the encrypted data key is decrypted based on the decrypted first modification key and the …
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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 May 18, 2006 and granted September 15, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.