A California man said he delivered his brother's wedding rings during his wedding ceremony using a drone, a device that is becoming less expensive to obtain.

Kevin Good said he thought he had an 80 percent chance of successfully delivering the wedding rings during the ceremony in San Francisco, and luckily it worked out OK.

"The other 20 percent is that it could go crashing into the bride's mother's face," he said. "At the end of the wedding, that was what everyone was talking about," Good said. "It was pretty awesome."

Small drones are becoming easier for ordinary people to obtain and can be bought online for $300 or less, The Washington Post reported Saturday.

People have used them to produce aerial sports recruiting videos, map crops and help locate poachers in Africa, the Post said.

Some privacy and civil rights activists worry the small, electronic devices to which video cameras can be attached, allow neighbors to spy on each other.

"Drones make it possible to invade privacy without even trespassing," said Amie Stepanovich, a surveillance expert at the Electronic Privacy Information Center. "This is a real concern."