EP 1275250 A1 20030115 - METHOD AND APPARATUS FOR ENABLING RANDOM ACCESS TO INDIVIDUAL PICTURES IN AN ENCRYPTED VIDEO STREAM
Title (en)
METHOD AND APPARATUS FOR ENABLING RANDOM ACCESS TO INDIVIDUAL PICTURES IN AN ENCRYPTED VIDEO STREAM
Title (de)
VERFAHREN UND GERÄT ZUM ERMÖGLICHEN VON DIREKTZUGRIFF AUF EINZELNE BILDER IN EINEM VERSCHLÜSSELTEN VIDEOSTROM
Title (fr)
PROCEDE ET APPAREIL PERMETTANT L'ACCES ALEATOIRE A DES IMAGES INDIVIDUELLES DANS UN FLOT DE VIDEO CHIFFRE
Publication
Application
Priority
US 0011891 W 20000502
Abstract (en)
[origin: WO0215579A1] A system for providing conditional access to packetized picture (video), audio or other data. The system selectively encrypts packetized data (105) such that transport packets (130, 150) that include header data (131, 151) are unencrypted, while all other transport packets (140, 141) that do not include header data are encrypted. This allows the transport packets with the header data (130, 150) to be randomly accessed from a memory (230, 310), which is particularly advantageous for performing "trick modes", such as fast forward and fast reverse, e.g., in a video-on-demand service. After the transport packets are selectively encrypted and stored, transport scrambling and control bits (132, 142, 152) for each packet (130, 140, 150) can be accessed to determine whether the packet is encrypted, and consequently, whether the packet includes header data. If a packet includes header data, it is suitable for use in a trick mode since it provides data from the start of a video, audio or other data packet.
IPC 1-7
IPC 8 full level
H04N 7/167 (2006.01); H04N 7/173 (2006.01)
CPC (source: EP KR)
H04N 7/1675 (2013.01 - EP); H04N 7/17318 (2013.01 - EP); H04N 7/17336 (2013.01 - EP); H04N 21/2347 (2013.01 - KR); H04N 21/2387 (2013.01 - EP); H04N 21/23897 (2013.01 - EP); H04N 21/47202 (2013.01 - EP)
Citation (search report)
See references of WO 0215579A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0215579 A1 20020221; AU 4814400 A 20020225; CA 2408232 A1 20020221; CA 2408232 C 20080115; CN 1452840 A 20031029; EP 1275250 A1 20030115; KR 20020091254 A 20021205
DOCDB simple family (application)
US 0011891 W 20000502; AU 4814400 A 20000502; CA 2408232 A 20000502; CN 00819492 A 20000502; EP 00930295 A 20000502; KR 20027014574 A 20021030