Pero wrote:Intention is the difference. Above you're talking about relationship, not transmission. Transmission doesn't have anything to do with it. (though even for relationship you don't have to be together with the teacher physically)
The teacher has to have the intention to transmit or there is no transmitting. The person on the receiving end has to have the intention to receive, otherwise there can be no receiving. So it's like someone calls you and you don't pick the phone or you pick up the phone. The moment you picked up the phone it's no longer a one-way communication.
The intention on the part of the teacher can be in writing, painting, speaking, moving, etc. A record is made with the intention to bring it to others. Others listen to the teaching - live or recorded - with the intention to receive something. Thus there is no apparent need for a live event.