Invention Grant
- Patent Title: Secure presentation of media streams in response to encrypted content
- Patent Title (中): 安全地呈现媒体流以响应加密的内容
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Application No.: US12726034Application Date: 2010-03-17
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Publication No.: US08280051B2Publication Date: 2012-10-02
- Inventor: Michael A. Malcolm , Daniel A. Collins , Stephen Watson , Paul Rechsteiner , Kevin Hui
- Applicant: Michael A. Malcolm , Daniel A. Collins , Stephen Watson , Paul Rechsteiner , Kevin Hui
- Applicant Address: US CA Sunnyvale
- Assignee: Kaleidescape, Inc.
- Current Assignee: Kaleidescape, Inc.
- Current Assignee Address: US CA Sunnyvale
- Main IPC: H04K1/04
- IPC: H04K1/04 ; H04K1/00 ; H04N7/167 ; G06F11/30

Abstract:
Secure presentation of media streams includes encoding the media streams into digital content, encrypting a portion of that digital content, the portion being required for presentation, in which the encrypted version is substantially unchanged in formatting parameters from the clear version of the digital content. Selecting those portions for encryption so there is no change in distribution of the media stream: packetization of the digital data, or synchronization of audio with video portions of the media stream. When encoding the media stream into MPEG-2, refraining from encrypting information by which the video block data is described, packet formatting information, and encrypting the video block data using a block-substitution cipher. A block-substitution cipher can be used to encrypt each sequence of 16 bytes of video data in each packet, possibly leaving as many as 15 bytes of video data in each packet in the clear.
Public/Granted literature
- US20100172498A1 SECURE PRESENTATION OF MEDIA STREAMS IN RESPONSE TO ENCRYPTED CONTENT Public/Granted day:2010-07-08
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