License Agreement, License, Lease or Permit. - No person may utilize, exploit, occupy, possess or conduct any activity within any forest and grazing land, or establish, install, add and operate any wood or forest products processing plant, unless he had been authorized to do under a license agreement, license, lease or permit: Provided, That when the national interest so requires, the President may amend, modify, replace, or rescind any contract, concession, permit, license, or any other form of privilege granted herein: Provided, further, That upon the recommendation of the appropriate government agency, the President may, pending the conduct of appropriate hearing, order the summary suspension of any such contract, concession, license, permit, lease or privilege granted under this decree for violation of any of the condition therein such as those pertaining but not limited to reforestation, pollution, environmental protection, export limitation or such condition as are prescribed by the Minister of Natural Resources in daily issued regulations.