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Domestic Drone Countermeasures says its products will impede “all typical drone sensors,” including camera capability. The company is offering “many different, large area, small area, mobile and fixed countermeasures.”

Its lead engineer, Tim Faucett, offers a simple explanation for why customers should want his products: “Everybody’s going to have access to a drone. People are going to have good intentions with them, and people are going to have bad intentions with them,” he told Scientific American magazine.

Protecting against those bad actors — soon to be equipped with small, undetectable drones with state-of-the-art cameras — is the goal of Mr. Faucett and others.

For Mr. Franklin, who is developing the DroneShield, the impetus for his invention came after he bought a small Parrot AR Drone and began flying it around his neighborhood. The craft can be bought online and in stores for about $300.

In Mr. Franklin’s case, he ended up crashing the drone in his neighbor’s yard.

“I had to go to their front door and apologize for landing a drone in their yard,” Mr. Franklin said. The ordeal helped him realize how beneficial a drone detection system could be, particularly to his neighbors.

He is experimenting with a number of technologies and is accepting donations to fund his research, and already is taking advance orders.

Mr. Franklin’s efforts are examples of how, for anti-drone businessmen, the time to invent, innovate, patent and sell is now.

For the drone industry, those efforts are proof that plenty of education and public relations work remains to be done.

“It makes everybody refocus on securing [citizens’] privacy” rights, Mr. McDonald said. “We just have to educate people more effectively. What we don’t want is to lose a technological advantage to the point where competing nations are ahead of us.”