If you watch another live news channel you are obligated to buy a licence.
I wonder if is the same case for say a Nvidia launch that is live on Twitch or such that many here will have watched (seen the threads).
apparently only if it is being broadcast on "TV" at the same time
(though IMO it is a reasonable point to raise... what exactly is "TV" when the lines become a bit blurred like that... it isn't just terrestrial and satellite TV but things like BT TV delivered over the net is "TV" or is it?)