Inasignificanttighteningoflegalcontrolsoverthepress,LordIrvine,theLordChancellor,willintroduceadraftbillthatwillproposemakingpaymentstowitnessesillegalandwillstrictlycontroltheamountofpublicitythatcanbegiventoacasebeforeatrialbegins.
其中,第一句里的asignificanttightening该如何理解?