Protecting journalists' sources confidentiality helps the press in fulfilling its watchdog function. Disclosing these sources in front of the courts of law serves the interests of the justice. This book analyzes the case law, the statutory instruments and the journalists' professional codes of conduct in United Kingdom, the European Court of Human Rights and the United States to see how these jurisdictions accommodate these two legitimate and competing interests. The book examines the theories behind the journalists' privilege, the procedural issues surrounding the matter and the scope of protection. This book will be of interest to lawyers, students, scholars, journalists and policy makers.