law: Information Technology Act, 2000
  19. Recognition of foreign 
  
  Certifying Authorities. – 
  
  (1) Subject to such 
  
  conditions and restrictions as may be specified, by regulations, the Controller 
  
  may, with the previous approval of the Central Government, and by notification 
  
  in the Official Gazette, recognise any Certifying Authority as a Certifying 
  
  Authority for the purposes of this Act.
  (2) Where any Certifying 
  
  Authority is recognised under sub-section (1), the Digital Signature Certificate 
  
  issued by such Certifying Authority shall be valid for the purposes of this Act.
  (3) The Controller may if he 
  
  is satisfied that any Certifying Authority has contravened any of the conditions 
  
  and restrictions subject to which it was granted recognition under sub-section 
  
  (1), he may, for reasons to be recorded in writing, by notification in the 
  
  Official Gazette, revoke such recognition.