Patent · US Expired

Adaptive decoding system for processing encrypted and non-encrypted broadcast, cable or satellite video data

US5933500A · kind A · utility

170Cited by
3References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 27, 1996
Grant dateAug 3, 1999
Priority date
Expiry dateNov 27, 2016

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG11B2220/90
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

An adaptive decoder generates a program representative datastream, in selectable, encrypted or decrypted form. A method for adaptively processing input encrypted program data with an associated encryption code provides either an encrypted or a decrypted program output. In an encrypted mode, encrypted program data and an associated encryption code is exported to an output port. In a decrypted mode, input encrypted program data is decrypted using an encryption key derived from the encryption code to provide decrypted program data. The decrypted program data is exported to the output port. Non-encrypted program data is exported to an output port in a selectable non-encrypted mode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.