公开(公告)号：CA2522046A1

公开(公告)日：2004-11-11

申请号：CA2522046

申请日：2003-09-19

Applicant: IBM

Inventor： VENKA-TRAMANI CHITRA ,  WESTERINK PETER ,  AMINI LISA D ,  VERSCHEURE OLIVIER ,  FROSSARD PASCAL

IPC: H04L29/06

Abstract: Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.

公开(公告)号：CA2516336A1

公开(公告)日：2004-11-04

申请号：CA2516336

申请日：2004-03-08

Applicant: IBM

Inventor： FROSSARD PASCAL ,  WESTERINK PETER ,  VERSCHEURE OLIVIER ,  AMINI LISA

IPC: G06F15/16 ,  H04L20060101 ,  H04L29/06

Abstract: A system and method for streaming data over a communications network with varying streaming conditions, includes conditioning a data stream to create conditioned data representations including encoded representations targeting running conditions, wherein conditioning includes partitioning the data stream into data units, and generating the encoded representations of each of the data units, packaging the conditioned data representations with metadata specifying a target set of running conditions, wherein the conditioned data representations are packaged by pre-computing one or more trajectories among the encoded representations based on a given finite set of streaming conditions, observing a current run-time condition and selecting one of the packaged conditioned data representations for streaming over the computing network according to the running conditions in view of the current run-time condition in accordance with the observed current streaming condition, and a communications network responsive to the media server for streaming the selected packaged conditioned data representation.