Avid Technology Limited

Metaglue Corporation

Oliver Morgan

Katherine H Cornog

James Robert Hamilton

Tools and techniques are provided to detect faked, or tampered, or unauthorized digital media, such as video, audio, still images, and multimedia clips, and provide and display measures of confidence and validity. A computer system that supports distribution of digital media includes a database that stores information about distributed digital media that enables verification of such digital media. A computer system having access to that database can receive distributed digital media and compute verification data from that digital media. The computed verification data can be compared to the stored information in the database, to determine whether there is any digital media for which the verification data matched the stored information. If there is no match, the computer system can provide feedback that the received digital media cannot be verified. In the event of a match, the computer system can provide feedback that the received digital media has been verified.

Managing integrity of distributed digital media

A method and system are provided for efficiently verifying the integrity of file-based video audio and other essence in a content production system. The method involves creating a sequence of hash codes for the editable units of the essence, which are stored as metadata apart from the content (either in a separate file or in a separate portion of the same file), and are correlated to the content by a time label (which may be an offset or a timecode number). Upon retrieval from storage, the hash codes are generated for the retrieved essence and compared to the stored hash codes to verify that the content has not been modified.

Content integrity management system

By providing an index that stores information about how to access each grouping of elements in an interleaved data stream and each element within each grouping, random access to each element in the interleaved data stream can be achieved. The index may store a temporal offset for each grouping for interleaved data streams in which the order of data samples in the interleaved data stream is different from the order in which those data samples are used to present the data stream. The information that allows each element in a grouping to be accessed may include information defining the length of each element, or information describing the relative position of each element in a grouping, such as a map table. Such a map table may have an entry for each data type, wherein each entry includes an indication of information used to access a sample of the data type.

Indexing interleaved media data

Random access to arbitrary images, whether frames or fields, of a video segment compressed using both interframe and intraframe techniques may be enhanced by including state information, for decoding and display, at appropriate points in the compressed bitstream to enable random access to each intraframe compressed image. The state information may be inserted during compression or by processing the bitstream of compressed data. An image index also may be generated that maps each temporal image in a decompressed output image sequence to an offset in the compressed bitstream of the data used to decode the image. The index may be created during compression or by processing the bitstream of compressed data. To access one or more samples starting with a specified point in time in a decompressed output image sequence, the index is accessed using the specified point in time to identify another sample in the decompressed output image sequence for which data is used to produce the specified sample. The identity of the other sample is used to access the index to identify a location in the compressed data for the data used to produce the specified sample.

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Lexington, MA, United States of America

Oliver Morgan