As it has been raised, I'll explain.
Safeguarding & Photos / Filming
Schools have to get parental permission to use photos of children at the school on internet / papers etc. This is because some children may be at risk if their location is identified. Think DA victims, adopted children etc. Some people can be very diligent searching facebook, twitter etc. for school related stuff to try to spot their child. (Also face recognition technology is improving all the time).
OK, you could say that these children should be excluded from concerts, plays etc. But these children have almost by definition been through a lot. Why would you want to stop them having the lovely experience of a leavers performance just so your Auntie Flo's school friend can see photos of the event on facebook? Remember many people are rubbish at privacy settings, the school has to deal with that not just the sensible ones who manage things well.
Our school manages it well. The HT permits filming & photos, but stands up at the start or end and says only put online if you have permission from the parents of all children in the photo. For me, with the level of risk to my adopted children, this is a sensible middle path. If parents cannot follow the basic request of asking permission then the school would need to go down the banning route. I hope that never happens.
end of public service message