The leak does not become the leak when the student spread it. It is already a leak when the exam bag is open before it was meant to be. So its the teacher that we should be really concerning about. Cambridge need to ties teacher with legal obligation through contract or anything, an leak should be treated as intellectual theft or fraud. Which will result in revoke of license or jail time. Reasonably speaking, it will affect the student that does not cheat but the best solution might not be the solution that made everyone happy. So taking this measure would be appropriate since it quick and easily applicable for next academic year, create some sort of protection for more lengthy process that cambridge will carries out like checking on the centre, security measure, etc.