64With regard to those interests, the Court of Justice held that the particularly sensitive and essential nature of the public interests concerned, combined with the fact that access must be refused by the institution, under Article 4(1)(a) of Regulation No 1049/2001 if disclosure of a document to the public undermined those interests, conferred on the decision which must thus be adopted by the institution a complex and delicate nature calling for the exercise of particular care and that, in the present case, such a decision therefore required a margin of appreciation (judgments of 1 February 2007, Sison v Council, C‑266/05 P, EU:C:2007:75, paragraph 35, and of 7 February 2018, Access Info Europe v Commission, T‑851/16, EU:T:2018:69, paragraph 38).
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