Hi wingedfish, This is how I understand it. "would" is correct. The sense is "it would jeopardise informants if it was disclosed, but in fact it won't be disclosed (because the judge will seal it)".
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wingedfishIf a serious crisis would occur, the government should take immediate action.In the meaning that's almost certainly intended (crisis occurs, then government takes immediate action), this is wrong. You would say, in increasing order of formality (as I perceive it), "if a serious crisis occurs...", or "... were to occur ..."