69It must be recalled that the Court stated, in its reasoning in the judgment in AM & S Europe v Commission relating to legal professional privilege in investigation procedures in matters of competition law, that that area of European Union law must take into account the principles and concepts common to the laws of the Member States concerning the observance of confidentiality, in particular, as regards certain communications between lawyer and client (see paragraph 18 of that judgment). For that purpose, the Court compared various national laws.
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