law: Special Marriage Act, 1954 
  37. permanent alimony and maintenance
  (1) Any court
  
  exercising jurisdiction under Chapter V or Chapter VI may, at the time of
  
  passing any decree or at any time subsequent to the decree, on application made
  
  to it for the purpose, order that the husband shall secure to the wife for her
  
  maintenance and support, if necessary, by a charge on the husband’s property,
  
  such gross sum or such monthly or periodical payment of money for a term not
  
  exceeding her life, as, having regard to her own property, if any, her
  
  husband’s property and ability 39[the conduct of the parties and
  
  other circumstances of the case], it may seem to the court to be just.
  (2) If the district
  
  court is satisfied that there in a change in the circumstances of either party
  
  at any time after it has made an order under sub-section (1), it may, at the
  
  instance of either party, vary, modify or rescind any such order in such manner
  
  as it may seem to the court to be just.
  (3) If the district
  
  court is satisfied that the wife in whose favor an order has been made under
  
  this section has remarried or is not leading a chaste life, 40[it
  
  may, at the instance of the husband vary, modify or rescind any such order and
  
  in such manner as the court may deem just.]