Foreword by Patricia Arias -- Introduction by Helena Torroja Mateu -- Afghanistan and Syria: Non-state Actors and their Negative Impact on Human Security by Mario Laborie -- Delimitation and Presence of PMSCs: Impact on Human Rights by Felipe Daza -- The Ineffectiveness of the Current Definition of a ‘Mercenary’ in International Humanitarian and Criminal Law by José L. Gómez del Prado -- …