Generally speaking, the answer is NO. An authorisation or permit is required from the respective regulatory bodies before flying a drone. However, most of the countries allow you to fly a small drone if you can comply certain rules. (Please refer to your local laws)

In Malaysia, for example, you can fly a small drone without authorisation, if...

1) your drone is less than 20 kg and the flight is at the height of not more than 400 feet above the surface of the earth,

2) you are satisfied that your flight can safely be made, and

3) you can maintain direct and unaided visual contact with your drone sufficient to monitor its flight path in relation to other aircrafts, persons, vehicles, vessels and structures for the purpose of avoiding collisions.