Chapter I IntroductionF1 United Kingdom Repealed Original text. Later amendments are not shown. GENERAL ASPECTS THREATS TO, AND VULNERABILITIES OF SYSTEMS SECURITY MEASURES SYSTEM-SPECIFIC SECURITY REQUIREMENT STATEMENT (SSRS) SECURITY MODES OF OPERATION Annotations Textual amendments F1 Repealed by Council Decision of 31 March 2011 on the security rules for protecting EU classified information (2011/292/EU). Chapter I