EP 1486071 A2 20041215 - ELEMENTARY STREAM PARTIAL ENCRYPTION
Title (en)
ELEMENTARY STREAM PARTIAL ENCRYPTION
Title (de)
ELEMENTARSTROM-PARTIALVERSCHLÜSSELUNG
Title (fr)
CRYPTAGE PARTIEL DE TRAINS DE DONNEES ELEMENTAIRES
Publication
Application
Priority
- CA 2405865 A 20021001
- US 0240051 W 20021213
- US 3791402 A 20020102
Abstract (en)
[origin: WO03061173A2] An encryption arrangement for multiple encryption of television programs. A system according toembodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple conditional access encryption systems associated with multiple manufacturer's set-top boxes within a single system. In one embodiment, only audio data are encrypted leaving video in the clear. By only encrypting a portion of the program, dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of programs to be carried over the samebandwidth while permitting coexistence of multiple conditional access systems in a single cable television system.
IPC 1-7
IPC 8 full level
H04L 9/18 (2006.01); H04N 7/167 (2011.01); H04N 21/2347 (2011.01); H04N 21/2362 (2011.01); H04N 21/266 (2011.01); H04N 21/434 (2011.01); H04N 21/4405 (2011.01); H04N 21/4623 (2011.01); H04N 21/835 (2011.01)
CPC (source: EP KR)
H04N 7/10 (2013.01 - KR); H04N 7/1675 (2013.01 - EP); H04N 21/2347 (2013.01 - KR); H04N 21/23476 (2013.01 - EP); H04N 21/2362 (2013.01 - EP); H04N 21/26606 (2013.01 - EP); H04N 21/4345 (2013.01 - EP); H04N 21/44055 (2013.01 - EP); H04N 21/4623 (2013.01 - EP); H04N 21/835 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
WO 03061173 A2 20030724; WO 03061173 A3 20040923; AU 2002357846 A1 20030730; AU 2002357846 A8 20030730; CN 1633809 A 20050629; CN 1633809 B 20100421; EP 1486071 A2 20041215; EP 1486071 A4 20090930; JP 2005515694 A 20050526; JP 4446743 B2 20100407; KR 101004196 B1 20101224; KR 20040068994 A 20040802; MX PA04006400 A 20041004
DOCDB simple family (application)
US 0240051 W 20021213; AU 2002357846 A 20021213; CN 02828452 A 20021213; EP 02792388 A 20021213; JP 2003561138 A 20021213; KR 20047010464 A 20021213; MX PA04006400 A 20021213