There are some rules by the government of the country where you fly things in the sky, specially the drone. Always check the security protocols. A few common rules are as follows:

• You cannot fly a drone within 5 miles of an airport
• You must keep the drone within your eyesight
• You are not allowed to go higher than 400 feet (around 0.12 km)
• You cannot fly a drone in busy traffic areas
• You must register your drone if you use it for business purposes or professionally; you must have a license
• Always know the local rules before flying a drone