CENVAT credit scope expanded to include additional and calamity duties, with specified utilization and removal rules. Rule 57AB is restructured to define CENVAT credit available to manufacturers, allowing credit of duties in the First and Second Schedules, specified additional duties, the National Calamity Contingent duty and equivalent customs duty on inputs or capital goods received in the factory on or after 1 March 2001, clarifying credit when goods cease to be exempt, prescribing utilization for duty on final products or removed inputs/capital goods, timing for utilisation, payment and invoicing on removals, and restricting calamity-duty credit use to payment of that duty.