Methods and systems enable uncompressed source data, corresponding to previously-compressed data, to be manipulated or otherwise modified, prior to being rendered by a rendering application. For example, audio data can be modified to include additional audio content, and/or video data can be modified...http://www.google.fr/patents/US8160154?utm_source=gb-gplus-shareBrevet US8160154 - Encoding and decoding methods and systems
