39While the Member States remain in principle free, by virtue of the proviso in Article 34(1) of Regulation No 44/2001, to determine, according to their own ideas, what public policy requires, the limits of that concept are a matter of interpretation of that regulation (see judgment of 28 April 2009 in Apostolides, C‑420/07, EU:C:2009:271, paragraph 56 and the case-law cited).
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