what is pre-watershed version

[artisticforge .]

hello;

while running --info on a program two versions came up which i had not
seen before, pre-watershed & pre-watershed2.

what are meanings of all the various versions?
signed & audio described are self explanatory
default & original are generic terms

editorial is an odd one.

the program is : http://www.bbc.co.uk/programmes/b01jcc8b

-- 
terry l. ridder ><>