Translate the following English sentence to French:
"However, you mentioned the concept of 'confidentiality' in connection with transparency, and I would like to ask you where this concept of 'confidentiality' begins and ends because I think this is the most sensitive point if we are to win back the trust of European citizens."
Mais vous avez évoqué la notion de "secret" au sujet de la transparence, et je voudrais vous demander où commence et où finit cette notion, car j' estime que c' est là le point le plus délicat si nous voulons regagner la confiance des citoyens européens.