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UltraViolet files use a profile of SMPTE Timed Text (SMPTE TT), which is in turn based on W3C Timed Text Markup Language (TTML). TT incorporates both Unicode text and PNG graphics for captions, subtitles for the deaf and hard of hearing (SDH), and other types of subtitles and subpictures such as sign language and written commentaries.
