07024485 is referenced by 108 patents and cites 35 patents.

Files are divided into parts and at least some of the parts are transmitted to a client using a communication channel. At least some of the transmitted parts are cached locally. This allows subsequent streaming playback of the file while using less bandwidth by transmitting the part of the file that hasn't been cached, and combining the cached parts with the transmitted parts. In some embodiments, files may be represented at a low quality level by a first data set, and at higher quality levels with additional data sets. Data sets are cached locally, so that during subsequent streaming playback of the file, the quality level of the playback may be improved by sending additional data sets using bandwidth that would otherwise be dedicated to transmitting the cached data sets.

Title
System for controlling and enforcing playback restrictions for a media file by splitting the media file into usable and unusable portions for playback
Application Number
10/291210
Publication Number
7024485 (B2)
Application Date
November 8, 2002
Publication Date
April 4, 2006
Inventor
Amir Doron
San Diego
CA, US
Ted E Dunning
San Diego
CA, US
Agent
James J DeCarlo Esq
Assignee
Yahoo
CA, US
IPC
G06F 15/16
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