By Hyonhee Shin

SEOUL, Nov 22 (Reuters) - Debate is brewing in South Korea over efforts to scrap a decades-old ban on North Korean media, as changing attitudes fuel renewed calls to review a national security law dating from the Cold War.

South Korea's National Security Act blocks access to the North's government websites and media, barring efforts at "praising, inciting or propagating" its activities.

The neighbours are still technically at war since an armistice put an end to fighting in the 1950-1953 Korean War, rather than a peace treaty.

"Article 7 forces people to harbour hostility toward the North as it suppresses anyone's freedom to review North Korean materials," said Jang Kyung-wook of Minbyun, Usa private proxies a collective of human rights lawyers, referring to a key provision of the law.