Distribution rights for content can get pretty complicated. Unnecessarily complicated.
There are so many examples of this, like how impossible it is to watch some UK football (soccer) matches online if you live within the UK. If you live outside the UK, then it’s very easy.
In the case of those sports matches, it’s because clubs don’t want to risk seeing a drop in ticket sales at the stadium.
What might happen with Doctor Who in your country is that someone ones the rights to the original series but someone else owns the rights to the new modern era.
There are so many examples of this, like how impossible it is to watch some UK football (soccer) matches online if you live within the UK. If you live outside the UK, then it’s very easy.
In the case of those sports matches, it’s because clubs don’t want to risk seeing a drop in ticket sales at the stadium.
What might happen with Doctor Who in your country is that someone ones the rights to the original series but someone else owns the rights to the new modern era.