Police said Thursday they have compiled a list of Web sites that are refusing to comply with demands to delete illegal or harmful information in order to protect their revenue streams.
The list was issued to advertising agencies to encourage them to avoid placing paid ads on the sites, the National Police Agency said.
The Web sites targeted in the campaign include those that supply child pornography and obscene images as well as information on narcotics and guns.
The list was drawn up by the Internet Hotline Center, which is in charge of asking Web sites to delete illegal or harmful information on behalf of the NPA.
According to an NPA survey in 2012, 46 percent of sites that refused to comply with such requests made money from ads. An NPA panel called for countermeasures in 2013, noting that the administrators of such sites are cashing in on advertising revenue.
The list includes the names and addresses of the sites and categorizes the illegal and harmful information they are known for. It is intended to help advertising agencies screen their clients.
The list will also be provided to the Japan Internet Advertising Association, which has 156 member agencies, the Japan Affiliate Service Kyokai and the Mobile Affiliate Conference.