Section 120
SEC. 120. No land originally acquired in any manner under the provisions of this Act, nor any permanent improvement on such land, shall be encumbered, alienated, or transferred, except to persons, corporations, associations, or partnerships who may acquire lands of the public domain under this Act; to corporations organized in the Philippine Islands authorized therefor by their charters, and, upon express authorization by the Philippine Legislature, to citizens of countries the laws of which grant to citizens of the Philippine Islands the same right to acquire, hold, lease, encumber, dispose of, or alienate land, or permanent improvements thereon, or any interest therein, as to their own citizens, only in the manner and to the extent specified in such laws, and while the same are in force, but not thereafter.