Vietnam's media sector is regulated by the government under the 2004 Law on Publication. It is generally perceived that the country media sector is controlled by the government and follows the official communist party line, though some newspapers are relatively outspoken. The Voice of Vietnam (VOV) is the official state-run national radio broadcasting service, broadcasting internationally via shortwave using rented transmitters in other countries and providing broadcasts from its website, while Vietnam Television (VTV) is the national television broadcasting company. Since 1997, Vietnam has regulated public internet access extensively using both legal and technical means. The resulting lockdown is widely referred to as the "Bamboo Firewall". The collaborative project OpenNet Initiative classifies Vietnam's level of online political censorship to be "pervasive", while Reporters Without Borders (RWB) considers Vietnam to be one of 15 global "internet enemies". Though the government of Vietnam maintains that such censorship is necessary to safeguard the country against obscene or sexually explicit content, many political and religious websites that are deemed to be undermining state authority are also blocked.