Method and apparatus for networked information dissemination through secure transcoding

Yuan-Chi Chang (Inventor), Chung-Sheng Li (Inventor), Richard Han (Inventor), John R. Smith (Inventor)

Research output: Patent


A method and system enables network intermediaries such as proxies to transcode multimedia data without violating end-to-end security guarantees. In one embodiment, a content provider decomposes a data stream into a plurality of components, each of which are independently encrypted. In a preferred embodiment, an intermediary or proxy performs transcoding of the components by prioritizing and dropping predetermined components, in accordance with unencrypted clear-text metadata associated with each component, without the need for decrypting the components. Clear-text metadata preferably provides a semantic understanding of the absolute or relative importance/priority of the components with respect to each other, thereby facilitating the transcoding process. The destination/client device can subsequently decrypt the components transmitted by the transcoding proxy and reassemble them into a representation of the original data content.
Original languageEnglish
Patent number6963972
IPCG06F 11/30,H04L 9/00,G06F 13/00,H04N 7/167,G06F 21/00,G06F 21/24
Priority date26/09/00
Publication statusPublished - 8 Nov 2005
Externally publishedYes


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