law: Patents Act, 1970
  35. Secrecy directions relating to inventions relevant for
  
  defense purposes
  (1) Where, in respect of an application made before or after the
  
  commencement of this Act for a patent, it appears to the Controller that the
  
  invention is one of a class notified to him by the Central Government as
  
  relevant for defense purposes, or, where otherwise the invention appears to him
  
  to be so relevant, he may give directions for prohibiting or restricting the
  
  publication of information with respect to the invention or the communication of
  
  such information to any person or class of persons specified in the directions.
  (2) Where the Controller gives any such directions as are
  
  referred to in sub-section (1), he shall give notice of the application and of
  
  the directions to the Central Government, and the Central Government shall,
  
  upon receipt of such notice, consider whether the publication of the invention
  
  would be prejudicial to the defense of India, and if upon such consideration,
  
  it appears to it that the publication of the invention would not so prejudice,
  
  give notice to the Controller to that effect, who shall thereupon revoke the
  
  directions and notify the applicant accordingly.
  (3) Without prejudice to the provisions contained in sub-section
  
  (1), where the Central Government is of opinion that an invention in respect of
  
  which the Controller has not given any directions under sub-section (1), is
  
  relevant for defense purposes, it may at any time before acceptance of the
  
  complete specification notify the Controller to that effect, and thereupon the
  
  provisions of that sub-section shall apply as if the invention were one of the
  
  class notified by the Central Government of the directions issued by him.