Thanks, Josh, that’s interesting. I didn’t realise AirPlay receivers would distinguish between protected and non-protected content, I assumed that it would display whatever the sending device sent (as the sending device will need to be properly authenticated to access the content). I wonder if this is some limitation of AirPlay vs AirPlay 2?
I’ve come to the conclusion that I need to buy a cable and assume that is the way I’ll use the projector. If I can get AirPlay working on whatever I buy, it will be a bonus, but not my expected method of operation. I don’t have an Apple TV (or a TV at all), and don’t want to buy an extra ‘thing’. The main attraction of a portable projector for me is that it can be kept in a cupboard and brought out on occasion when I want to watch a film. If I need extra devices to store and hook up I’ll probably just stick with watching on my MacBook Air! So a cable+adaptor is likely the simplest route if I’m going to get a projector.