law: Trade Marks Act, 1999  
  50. Power of Registrar for variation or
  
  cancellation of registration as registered user.- 
   (1) Without prejudice to the provisions of
  
  section 57, the registration of a person as registered user- 
  (a) may be varied by
  
  the Registrar as regards the goods or services in respect of which it has
  
  effect on the application in writing in the prescribed manner of the registered
  
  proprietor of the trade mark.
  (b) may be cancelled
  
  by the Registrar on the application in writing in the prescribed manner of the
  
  registered proprietor or of the registered user or of any other registered user
  
  of the trade mark.
  (c) may be cancelled
  
  by the Registrar on the application in writing in the prescribed manner of any
  
  person on any of the following grounds, namely:- 
  (i) that the
  
  registered user has used the trade mark otherwise than in accordance with the
  
  agreement under clause (a) of sub-section (1) of section 49 or in such way as
  
  to cause or to be likely to cause, deception or confusion.
  (ii) that the
  
  proprietor or the registered user misrepresented, or failed to disclose, some
  
  fact material to the applicant for registration which if accurately represented
  
  or disclosed would not have justified the registration of the registered user.
  (iii) that the
  
  circumstances have changed since the date of registration in such a way that at
  
  the date of such application for cancellation they would not have justified
  
  registration of the registered user.
  (iv) that the
  
  registration ought not to have been effected having regard to rights vested in
  
  the applicant by virtue of a contract in the performance of which he is
  
  interested.
  (d) may be cancelled
  
  by the Registrar on his own motion or on the application in writing in the
  
  prescribed manner by any person, on the ground that any stipulation in the
  
  agreement between the registered proprietor and the registered user regarding
  
  the quality of the goods or services in relation to which the trade mark is to
  
  be used is either not being enforced or is not being enforced or is not being
  
  complied with.
  (e) may be cancelled
  
  by the Registrar in respect of any goods or services in relation to which the
  
  trade mark is no longer registered.
  (2) The Registrar shall issue notice in the
  
  prescribed manner in respect of every application under this section to the
  
  registered proprietor and each registered user (not being the applicant) of the
  
  trade mark.
  (3) The procedure for canceling a registration
  
  shall be such as may be prescribed.
  Provided  that before canceling of registration,
  
  the registered proprietor shall be given a reasonable opportunity of being
  
  heard.