62. License when deemed revoked
A license is deemed to be revoked—
when, from a cause preceding the grant of it, the grantor ceases to have any interest in the property affected by the license;
when the licensee releases it, expressly or impliedly, to the grantor or his representative;
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 condition is fulfilled;
where the property affected by the license is destroyed or by superior force so permanently altered that the licensee can not longer exercise his right;
where the licensee becomes entitled to the absolute ownership of the property affected by the license;
where the license is granted for a specified purpose and the purpose is attained, or abandoned, or becomes impracticable;
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;
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;
in the case of an accessory license, when the interest or right to which it is accessory ceases to exist.