Concordat Watch. Concordats - treaties between the Holy See (the Vatican, headed by the pope) and more than three dozen countries which grant privileges to the Roman Catholic Church, extend papal influence, weaken church state separation, introduce Canon Law, lead to religious discrimination and can threaten human rights of Catholics and non-Catholics alike .Translation (automatic), German, French, Italian, Spanish, Polish, Portuguese, Croatian , Serbian, Slovenian, Czech, Slovak, Romanian Advan