News Column

"Secure Video Transcoding with Applications to Adaptive Streaming" in Patent Application Approval Process

July 22, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- A patent application by the inventors Wang, Xin (Rancho Palos Verdes, CA); He, Xingze (Los Angeles, CA); Zhang, Xinwen (Santa Clara, CA), filed on December 31, 2012, was made available online on July 10, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application has not been assigned to a company or institution.

The following quote was obtained by the news editors from the background information supplied by the inventors: "A video content provider or distributor may deliver various video contents to subscribers or users using different coding schemes suited for different devices, such as televisions, notebook computers, and mobile handsets. The video content distributor may support a plurality of video encoder and/or decoders (codecs), video media players, video frame rates, spatial resolutions, content bit-rates, end-devices, or combinations thereof. A video content may be converted from a source or original representation to various other representations to suit the different user devices and different distribution networks.

"With increasing numbers of network types, user device types, and content representations, a video content distributor may need to store different versions or representations of the same video content on a source server or a rented content delivery network (CDN) node to satisfy the needs of various user devices. The storage of multiple representations may increase a cost of content distribution (e.g., increased storage space in the source server or increased fee to rent the CDN node). To avoid storing multiple representations, a video transcoder may be introduced onto the source server or CDN nodes and configured to convert a video content from one representation to another, as requested by user devices. Thus, video transcoding may enable a seamless interaction between video content creation and consumption.

"In content preparation and delivery, transcoding devices (i.e. transcoders) implemented in CDN nodes, gateways, multipoint control units or servers, may be third party hardware and/or software. For example, content distributor NETFLIX may rent a third party transcoder belonging to AMAZON or AKAMAI, in which case the transcoder may be un-trusted by NETFLIX or its subscribing users. In existing video content delivery schemes, a video content going through a transcoding process may be completely exposed to the un-trusted third party transcoder. Consequently, privacy of users subscribing the video content, and the confidentiality and copyright of the video content may not be sufficiently protected."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "In one embodiment, the disclosure includes an apparatus comprising a processor configured to perform at least one transcoding operation on a first encrypted video frame to generate a second encrypted video frame.

"In another embodiment, the disclosure includes a method comprising performing at least one transcoding operation on a first encrypted video frame to generate a second encrypted video frame.

"In yet another embodiment, the disclosure includes an apparatus comprising a processor configured to retrieve a first encrypted video frame, wherein the first encrypted video frame is generated by encrypting an original video frame using an encryption key, and perform a transcoding operation on the encrypted video frame without revealing content of the original video frame.

"These and other features will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

"For a more complete understanding of this disclosure, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts.

"FIG. 1 illustrates an embodiment of a secure video content delivery scheme.

"FIG. 2 illustrates an exemplary encryption scheme.

"FIG. 3 illustrates an exemplary decryption scheme.

"FIGS. 4A and 4B are exemplary images of an original frame and an encrypted frame.

"FIG. 5 illustrates an embodiment of a secure transcoding scheme.

"FIG. 6 illustrates an exemplary down-sampling scheme for frame rate reduction.

"FIG. 7 illustrates an exemplary down-sampling scheme for spatial resolution reduction.

"FIG. 8 illustrates an embodiment of another secure transcoding scheme.

"FIG. 9 illustrates an embodiment of a re-encryption scheme.

"FIG. 10 illustrates an embodiment of a secure video delivery method.

"FIG. 11 illustrates a transcoding and re-encryption method.

"FIG. 12 illustrates an embodiment of a network node."

URL and more information on this patent application, see: Wang, Xin; He, Xingze; Zhang, Xinwen. Secure Video Transcoding with Applications to Adaptive Streaming. Filed December 31, 2012 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4121&p=83&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

Keywords for this news article include: Patents, Information Technology, Information and Data Encoding and Encryption.

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Source: Information Technology Newsweekly


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