law: Passports Act, 1967
  3. Passport or travel document for departure
  
  from India
  No person shall depart from, or attempt to
  
  depart from, India unless he holds in this behalf a valid passport or travel
  
  document.
  Explanation.- For the purposes of
  
  this section,-
  (a) "passport" includes a passport
  
  which having been issued by or under the authority of the Government of a
  
  foreign country satisfies the conditions prescribed under the Passport (Entry
  
  into India) Act, 1920 in respect of the 34 of 1920 class of passports to which
  
  it belongs;
  (b) "travel document" includes a
  
  travel document which having been issued by or under the authority of the
  
  Government of a foreign country satisfies the conditions prescribed.