I'm looking for ways to broadcast my PhD defence online (one component with a presentation, sharing either a PDF, a window, or the screen), and one component with video.  It is a public event: anyone should be able to watch it, there should be no user limit, and people should not need to have a Google Plus account.  It should also be recordable.  Our university uses Adobe Connect for this but... it sucks.  So I'm looking for alternatives.It appears a broadcast is possible through Google Hangout On Air, but I'm confused about the conditions.  On the one hand, a Hangout On Air has at most ten users at once, and all must be Google Plus users.  On the other hand, it is advertised as broadcast your conversation to the world for free, through a Youtube channel.  The latter does not sound like a ten-user limit, and it seems to be a broadcast on Youtube implies users should not need a Google Plus account just to watch my broadcast.Do Google Hangout broadcasts on youtube have a limited audience?Does anyone watching such a broadcast need a Google Plus account?
Do Google Hangout broadcasts on youtube have a limited audience, and must the audience have Google Plus?
youtube;google hangouts onair