When purchasing apps via the App Store or Google Play, the purchase is linked to the iTunes/Google account which was used to complete the purchase and the purchase will be available on all devices which are logged in with that iTunes/Google account.

In most school environments, each device will have a unique account and therefore 1 license will need to be purchased for each individual device, however this varies from school to school so it will be best to check this with your IT administrator.
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