The answer was given by Travis at the creation of the field. It is available here in a December 8, 2021 message.

I quote : "The origin country field is not the same as production country. It has been present on TV since 2015 or so. The introduction of the origin country field on movies is intended to bring field parity between TV and movie data and designed to indicate where a movie is originally released. This has generally nothing to do with the production countries (point is, although they are the same sometimes, they are certainly not all the time)."

For example, on netflix comes a movie or series at the same time in more than 50 countries. all countries are considered Origin Country???

For example, on netflix comes a movie or series at the same time in more than 50 countries. all countries are considered Origin Country???

If I recall correctly, in the case of multinational TV/VOD releases we set the origin country as per the home country of the distribution company (VOD, TV Network). So in the case of Netflix, it should be US (assuming that US is one of the release countries).

Another example a Korean series comes out at the same time in some countries and the Orignal country is the United States?

Another example a Korean series comes out at the same time in some countries and the Orignal country is the United States?

Well, content like this can be always discussed case-by-case. But imo the general idea is to have following fields tied together as a default (=original) translation of the movie/TV Show:

"original title" = title used for the first non-festival local release of the movie/TV Show
"original language" = language of the "original title" (this can be tricky, see our Bible)
"origin country" = country where was movie with "original title" first released

This is why the "origin country" isn't always the same as the "production country" (= countries of production and co-production companies which made the movie/TV Show).

@BlackSpirits said:

For example, on netflix comes a movie or series at the same time in more than 50 countries. all countries are considered Origin Country???

Another example a Korean series comes out at the same time in some countries and the Orignal country is the United States?

In case of simultaneous releases in multiple countries, we generally use the production country if it is part of the countries where the movies is released.