law: Indian Easements Act, 1882
  10. Lessor and mortgagor
  Subject to the provisions of section 8, a lessor may impose, on
  
  the property leased, any easement that does not derogate from the rights of the
  
  lessee as such, and a mortgagor may impose, on the property mortgaged, any
  
  easement that does not render the security insufficient. But a lessor or
  
  mortgagor cannot, without the consent of the lessee or mortgagee, impose any
  
  other easement on such property, unless it be to take effect on the termination
  
  of the lease or the redemption of the mortgage.
  Explanation:  A security is insufficient within the
  
  meaning of this section unless the value of the mortgaged property exceeds by
  
  one-third, or, if consisting of buildings, exceeds by one-half, the amount for
  
  the time being due on the mortgage.