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The subtitles were produced by www.unsv.com, a popular website for learning English.

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When Florida Postal Service worker Doug Hughes 

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landed his homemade gyrocopter on the west lawn of the U.S. Capitol,

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 in a daring bid to deliver a political message to the lawmakers,

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the security services were taken by surprise.

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He was quickly surrounded and taken away by police,

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his aircraft was checked for explosives, and now he faces several years of prison.

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But his stunt  highlighted once more 

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that the airspace around most of the public buildings 

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is easily penetrated by drones and light piloted aircraft,

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too small and flying too low to be safely prevented from reaching their goals.

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John Hansman a professor of Aeronautics and Astronautics 

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at Massachusetts Institute of Technology,

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said small, flying vehicles are not easy to detect and stop.

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"If you have a very small target, like a gyrocopter,

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which doesn't have a very large radar cross-section,

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so it's not reflecting much energy back, and it's close to the ground,

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you might get some signal coming there, 

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but you may actually think it's a building or a car moving on the ground, not a helicopter."

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Hansman noted that heavy traffic in downtown Washington 

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makes it even more difficult.

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"If you have a complex environment like an area around Washington

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 where you have lots of other vehicles on the ground,

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you have vehicles in the air, and you have something very small like this,

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 it's actually not that difficult for it to slip through the protection."

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The chairman of the American Leadership and Policy Foundation,

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David Stuckenberg, is a former military pilot who writes about the airspace security.

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Speaking via Skype, he said the present safety systems are inadequate.

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"We need to understand that we've been lucky

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 and as technology increases and as drones proliferate people

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 will increasingly look at these as weapons of opportunity 

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 or technologies that can be adapted for ill intent."

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Stuckenberg said a lot more needs to be done before such systems are in place,

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such as conducting thorough analyses and bringing new regulations.