公开(公告)号：US20180343478A1

公开(公告)日：2018-11-29

申请号：US15607542

申请日：2017-05-29

Applicant: Cisco Technology, Inc.

Inventor： Harel CAIN ,  Michal DEVIR ,  Gitty ZINGER ,  David ATIAS

IPC: H04N21/2343 ,  H04N21/236 ,  H04N21/234 ,  H04N21/434

Abstract: In one embodiment, a method comprising obtaining a stream comprising first network abstraction layer (NAL) units generated in a first encoding, the first NAL units including first slices, obtaining second NAL units generated in a second encoding, the second NAL including second slice(s), and stitching the second NAL units into the stream, the stitching including positioning the second slice(s) in respective position(s) in the stream formerly occupied by temporary slice(s) generated in the first encoding, and for the second slice(s) conforming at least one slice header syntax element and at least one network abstraction layer unit syntax element of a second slice to values of a temporary slice formerly occupying the position of the second slice, and retaining at least one other slice header syntax element of the second slice as encoded in the second encoding.

公开(公告)号：US20180295376A1

公开(公告)日：2018-10-11

申请号：US16004745

申请日：2018-06-11

Applicant: Cisco Technology, Inc.

Inventor： David WACHTFOGEL ,  Michal DEVIR ,  Harel CAIN

IPC: H04N19/467 ,  H04N21/2365 ,  H04N21/235

Abstract: In one embodiment, a system includes a Headend apparatus including a watermark processor to generate secondary video streams from sections of a primary video stream, group the secondary video streams in groups of at least two secondary video streams, the secondary video streams including units of data for use in watermarking across cryptoperiods in an end-user device which selects one secondary video stream in each group for rendering as part of a composited video stream in order to embed units of data of an identification in the composited video stream, wherein in each cryptoperiod, the watermark processor is operative to generate different groups of the secondary video streams from different non-overlapping portions of the primary video stream, and an encryption processor to generate control words, encrypt each secondary video stream with a different control word, and change the control word of each secondary video stream every cryptoperiod.

公开(公告)号：US20180285537A1

公开(公告)日：2018-10-04

申请号：US15473648

申请日：2017-03-30

Applicant: Cisco Technology, Inc.

Inventor： David WACHTFOGEL ,  Michal DEVIR ,  Harel CAIN

IPC: G06F21/16 ,  G06T1/00 ,  H04N19/44 ,  H04N21/8358 ,  H04N21/4405 ,  H04N5/913

Abstract: In one embodiment, a method for preventing a difference attack on watermarked video content is implemented on at least one computing device and includes: manipulating values of a set of pixels to embed a forensic watermark in at least one video frame in a video content item, where the manipulating is in accordance with a given magnitude of change in the values, and introducing random noise to the at least one video frame, where the random noise is random noise of the given magnitude.

公开(公告)号：US20180027237A1

公开(公告)日：2018-01-25

申请号：US15218127

申请日：2016-07-25

Applicant: Cisco Technology, Inc.

Inventor： Harel CAIN ,  Michal DEVIR ,  Yaron SELLA

IPC: H04N19/13 ,  H04N19/12 ,  H04N19/176 ,  H04N19/467 ,  H04N19/11 ,  H04N19/96

CPC classification number: H04N19/13 ,  H04N19/11 ,  H04N19/12 ,  H04N19/176 ,  H04N19/467 ,  H04N19/96

Abstract: In one embodiment of a method, system, and apparatus described herein, an encoded video is received. At least one set of areas of a spatially distinct region of a video frame to be modified is selected. An entropy layer from the spatially distinct region of a video frame. A state of the removed entropy layer and the location of a first area of the set of areas of the spatially distinct region of the video frame is stored. One area of the set of areas is decoded, the decoding occurring recursively until all areas of the set of areas of the spatially distinct region of the video frame for predicting and decoding the one area are decoded. A modification of the decoded one area is performed. The modified decoded one area is re-encoded according to a re-encoding condition. The stored state of the entropy layer is retrieved, and the entropy layer is re-applied at the first area to the spatially distinct region of the video frame which comprises the set of areas. Related methods, systems and apparatus are also described.