law: Trade Monopolies and Restrictive Trade Practices Act, 1969 
  33. Registrable Agreements Relating to Restrictive Trade Practices.
  (1) Every agreement falling within
  
  one or more of the following categories shall be deemed, for the purpose of
  
  this Act, to be an agreement relating to restrictive trade practices and shall
  
  be subject to registration in accordance with the provisions of this Chapter,
  
  namely :-
  (a) any agreement which
  
  restricts, or is likely to restrict, by any method the persons or classes of
  
  persons to whom goods are sold or from whom goods are bought;
  (b) any agreement
  
  requiring a purchaser of goods, as a condition of such purchase, to purchaser
  
  some other goods;
  (c) any agreement
  
  restricting in any manner the purchaser in the course of his trade from
  
  acquiring or otherwise dealing in any goods other than those of the seller or
  
  any other person;
  (d) any agreement to
  
  purchase or sell goods or to tender for the sale or purchase of goods only at
  
  prices or on terms or conditions agreed upon between the sellers or purchasers;
  (e) any agreement to
  
  grant or allow concessions or benefits, including allowances, discounts,
  
  rebates or credit in connection with, or by reason of, dealings;
  
  
  (f) any agreement to sell goods on condition that the prices to be charged on
  
  re-sale by the purchaser shall be the prices stipulated by the seller unless it
  
  is clearly stated that prices lower than those prices may be charged;
  (g) any agreement to
  
  limit, restrict or withhold the output or supply of any goods or allocate any
  
  area or market for the disposal of the goods;
  
  
  (h) any agreement not to employ or restrict the employment of any method,
  
  machinery or process in the manufacture of goods;
  (i) any agreement for
  
  the exclusion from any trade association of any person carrying on or intending
  
  to carry on, in good faith the trade in relation to which the trade association
  
  is formed;
  (j) any agreement to
  
  sell goods at such prices as would have the effect of eliminating competition
  
  or a competitor;
  (ja) any agreement
  
  restricting in any manner, the class or number of wholesalers, producers or
  
  suppliers from whom any goods may be bought;
  
  
  (jb) any agreement as to the bids which any of the parties thereto may offer at
  
  an auction for the sale of goods or any agreement whereby any party thereto
  
  agrees to abstain from bidding at any auction for the sale of goods;
  
  
  (k) any agreement not hereinbefore referred to in this section which the
  
  Central Government may, by notification specify for the time being as being one
  
  relating to a restrictive trade practice within the meaning of this sub-section
  
  pursuant to any recommendation made by the Commission in this behalf;
  
  
  (l) any agreement to enforce the carrying out of any such agreement as is
  
  referred to in this sub-section.
  (2) The provisions of this section
  
  shall apply, so far as may be, in relation to agreements making provision for
  
  services as they apply in relation to agreements connected with the production,
  
  storage, supply, distribution or control of goods.
  
  
  (3) No agreement falling within this section shall be subject to registration
  
  in accordance with the provisions of this Chapter if it is expressly authorised
  
  by or under any law for the time being in force or has the approval of the
  
  Central Government or if the Government is a party to such agreement.