You do not need anyone permission to record a conversation- as long as you are taking a part in that conversation
If that was the case, you wouldn't hear warning about recording conversation (for whatever reason) while calling to all sorts of customer services
Publicizing that conversation is a different story
Well here we are. Recording for personal references is one thing since nobody knows that you have the recording.
But once someone knows, like I personally had such case, I was threatened with all kinds of lawsuits in Poland if make it public.
It was one on one telephone and skype (with video) conversation(s)/conferences.
I cannot talk about details since it concerns public figures (actually legends in their own minds but nevertheless public in Poland)