I have a request.
This is the sdes tag found in files bought from the iTunes Store. It cannot be seen in MP3TAG but when you use MediaInfo, you can see it. It is the tag where they put the season description (unlike the single descriptions found on each TV episode). To prevent confusions with MediaInfo, I saw that these are the equivalents.
MEDIAINFO, MP3TAG, MY OWN UNDERSTANDING
desc, SUBTITLE, This is the "Description" tag in iTunes. It only allows about 255 characters. (Not sure but close.)
ldes, PODCASTDESC, This is the "Long Description" where it allows more characters than the SUBTITLE tag. This cannot be edited on iTunes.
sdes, none, This is the tag when you go to the iTunes Store, select a TV Show, you can see DESCRIPTION above the Episodes. This, somewhat gives the summary of the whole season.
I hope you understand this. Thank you.