I've been wondering how copyright works in relation to jokes. I mean, could you suddenly find that there's an injunction against telling certain jokes because they aren't seen to be in public domain.

Where do they draw the lines between someone ripping-off a comedian's act wholesale, and someone retelling a joke they heard, maybe in the course of that comedian's act, maybe in the bar at the interval.

Is there a DT of jokes anyhere?

(And the same kind of questions arise around stories...)