PHNOM PENH, Cambodia (AP) — A founder of the popular file-sharing Web site Pirate Bay was arrested in Cambodia at the request of Sweden, where he faces a one-year prison term for violating copyright laws, the authorities said on Monday.

The Cambodian authorities arrested Gottfrid Svartholm Warg, one of the site’s four founders, on Thursday at a home he had rented here in the capital, said Kirth Chantharith, a spokesman for the national police.

“He is being detained in Cambodia and we are waiting to expel him,” Mr. Chantharith said. Cambodia has no extradition treaty with Sweden but has requested details of Mr. Svartholm Warg’s crime in order to process his transfer, he said, adding that Cambodia would act as quickly as possible.

A Swedish court in 2009 convicted Mr. Svartholm Warg and the site’s three other founders on charges that they had assisted copyright infringement by helping millions of the site’s users to illegally download music, movies and computer games.