If your drone has a camera capable of taking pictures or videos, you must apply for permission at the National Aeronautical Authority NAA website. To get a prompt response from the ANA abide by the contact times advertised on their website. Orders that are made outside of such timeframes will definitely be delayed. 

The online e-AAN platform helps you make a direct payment without going through what was previously a time-wasting manual submission process. 

Set up the free account and register yourself as a pilot. The website shall automatically to English should it be your language of preference.

The simplicity of the applications allows you to use Google Maps to simplify the radius of your desired point of flight. Next, submit the dates and the desired time of flight. Your submissions will undergo review by AAN who responds in a few days.

Upon familiarizing yourself with AAN and its portal, the next time will be much easier. 

If I do not want to capture photography, videos or images of anything, should I still seek permission to fly the drone?

The answer is still yes. This extends to FPV operation. Privacy in most European countries is very strict. Infringement on other persons private space or property can land you in legal trouble. 

Can I bring my drone to Portugal?

There are no existing restrictions as to why you should not bring over a drone from outside. Just ensure it’s under your ownership and it meets the requirements of the airline concerned. 

Do I need drone liability insurance to fly a drone?

No. No part of the law expressly mentions that a pilot must have insurance.