公开(公告)号：US20180137208A1

公开(公告)日：2018-05-17

申请号：US15619938

申请日：2017-06-12

Applicant: Cisco Technology, Inc.

Inventor： Clint Earl Ricker ,  David S. Morgan

IPC: G06F17/30 ,  G06F9/48 ,  H04L9/08

CPC classification number: G06F16/9574 ,  G06F9/4881 ,  G06F16/435 ,  H04L9/065 ,  H04L9/0822 ,  H04L2209/60 ,  H04N21/8456 ,  H04N21/8586

Abstract: Segments of media content may be shared amongst multiple requesting entities in a cDVR environment. In one illustrative example, a first request to initiate recording of media content at a first start time is received from a first requesting entity. In response, a first encrypted copy of a first plurality of content segments of the media content is cached in network memory, in a first encryption window associated with a first encryption key. A first manifest including a first set of URLs is generated and sent to the first requesting entity, where URLs of the first set reference a first identifier of the first encryption window and a respective one of the content segments. If a second request to initiate recording of the media content is received from a second requesting entity at a second start time that does not exceed an interval threshold, no additional copy needs to be made. Here, a second manifest including a second set of URLs is generated and sent to the second requesting entity, where URLs of the second set also reference the first identifier of the first encryption window and a respective one of the content segments.