Encryption/decryption of program data but not psi data
CA 2873159 C · Owner: Zenith Electronics Corporation · Inventors: Hauge, Raymond C.; Lewis, Richard; Turner, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of keys to encrypt data in a transmitter and to decrypt encrypted data in a receiver are synchronized in accordance with a synchronization signal that opportunistically replaces a packet in an MPEG transport stream. Additionally or alternatively key related information is transmitted and/or received in place of a packet in the MPEG transport stream and is used to encrypt and/or decrypt data transmitted and/or received in the MPEG transport stream.
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 May 18, 2006 and granted June 20, 2017. 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.