The channels share similar content but with localised advertising and dubbing and/or subtitling. In larger German cities a few "special cinemas" use subtitling instead of dubbing. Either DVB or Teletext subtitling can be displayed when broadcast. A lot of French channels have teletext left only for subtitling. This is an Italian language version, with a clear soundtrack and legible English subtitling. SLS refers to the idea of subtitling in the same language as the audio. Advanced subtitling can also include additional media accessibility features such as "descriptive audio". There are many freeware and open source subtitling applications that support the SSA format. Therefore, subtitling offers a distinct advantage to aid comprehension. These are often used for court room transcripts and in live subtitling. Although similar to subtitling, SDH adds additional information to complement the verbal dimension. However, for many applications more advanced alternatives like DVB-SUB for subtitling are available. This practice of subtitling has been spread to neighbouring countries including South Korea and Taiwan. The DVD release of the episode contains a deliberate subtitling error. AdText.tv launched in 2008 for commercial subtitling.