The rules in the school Notre-Dame

Pupils aren't allowed to smoke. But, they are allowed to eat candy.
They aren't allowed to run on the playground. But, they are allowed
to run during sport lesson.
They aren't allowed to listen to music during the lesson.But,
they are allowed to listen to music outside.
They aren't allowed to use mobile phones.But,they are allowed
to take it.
They aren't allowed to take photos in school.But,they are allowed
to take photos during a trip.