This International Standard defines requirements and provides recommendations to publishers@ software developers@ content providers@ and hardware manufacturers for the data structure@ usability requirements@ playback systems and delivery systems for audiobooks in digital file format. It should be noted that throughout this International Standard@ the term audiobook is defined as any audio file or collection of audio files of primarily spoken word content that are played in a linear or specified order. Therefore@ spoken word audio with occasional music@ a narration of newspaper articles@ or other similar spoken word audio is assimilated to audiobooks in this standard.