law: Indian Easements Act, 1882
  62. License when deemed revoked
  A license is deemed to be revoked-
  (a) when, from a cause preceding the grant of it, the grantor
  
  ceases to have any interest in the property affected by the license;
  (b) when the licensee releases it, expressly or impliedly, to
  
  the grantor or his representative;
  (c) where it has been granted for a limited period, or acquired
  
  on condition that it shall become void on the performance or non-performance of
  
  a specified act, and the period expires, or the conditions is fulfilled;
  (d) where the property affected by the license is destroyed or
  
  by superior force so permanently altered that the licensee can no longer
  
  exercise his right;
  (e) where the Licensee becomes entitled to the absolute
  
  ownership of the property affected by the license;
  (f) where the license is granted for a specified purpose and the
  
  purpose is attained or abandoned, or becomes impracticable;
  (g) where the license is granted to the licensee as holding a
  
  particular office, employment or character, and such office, employment or
  
  character ceases to exist;
  (h) where the license totally ceases to be used as such for an
  
  unbroken period of twenty years, and such cessation is not in pursuance of a
  
  contract between the grantor and the licensee;
  (i) in the case of an accessory license, when the interest or
  
  right to which it is accessory ceases to exist.