44Second, Article 4 of Regulation No 1049/2001, by introducing a set of exceptions to the right of public access to documents of the institutions which is conferred by Article 1 of the regulation, permits the institutions to refuse access to a document in order to prevent disclosure of the document from undermining one of the interests protected by Article 4 (see, to that effect, Case C-266/05 P Sison v Council [2007] ECR I-1233, paragraph 62, and Case C‑280/11 P Council v Access Info Europe [2013] ECR, paragraph 29 and the case-law cited).
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