Microsoft Technology Licensing, LLC

Microsoft Corporation

Flexstake, Inc.

Robert K Hughes

Yongjun Wu

Shyam Sadhwani

Charles Finkelstein

John A Bocharov

John Carl Simmons

Sudheer Sirivara

John C Simmons

Charles A Finkelstein

Techniques are described for communicating encoded data using start code emulation prevention. The described techniques include obtaining at least one partially encrypted packet, identifying at least one portion of the packet that is unencrypted, and determining that the identified unencrypted portion(s) emulates a start code. Start code emulation prevention data or emulation prevention bytes (EPBs) may be inserted into only the encrypted portion of the packet. The modified packet may be communicated to another device/storage, along with an indication of which portion(s) of the packet are unencrypted. Upon receiving the packet and indication, the receiving device may identify and remove the EPBs in the identified unencrypted portion(s) of the packet, and decrypt the packet to recover the data. In some aspects, upon identifying the indication, the receiving device may only search for EPBs in the unencrypted portion(s) of the packet, thus yielding a more efficient start code emulation prevention process.

MPEG transport frame synchronization

Assembling streamed content for on-demand presentation is described. In embodiments, a media asset can be requested from a content distributor, and cacheable segments of the media asset are streamed to the requesting client device. The cacheable segments are received in an initial quality display format for uninterrupted playback of the media asset at the client device while the cacheable segments are being received. An asset matrix that correlates a bit rate and a time position for each cacheable segment in the media asset is also received. The cacheable segments of the media asset can be assembled according to the asset matrix to generate an assembled asset data file of the media asset. The assembled asset data file can then be back-filled with selected ones of the cacheable segments that are replaced with a highest quality display format for on-demand presentation of the media asset when selected for viewing.

Assembling streamed content for on-demand presentation

Growing community of inventors

Redmond, WA, United States of America

Robert K Hughes