Workers are seen inspecting and testing finished products but no manufacturing process is shown.
Initial leads pointed to China as a source of the attacks on banks, but the South says it has traced back the intrusion to the North.
The most recent cyberattack has focused attention on the two countries' technological rivalry.
An initial investigation links a Chinese address to a South Korean cyberattack, but experts have not ruled out North Korea's participation.
Investigators traced cyberattack to a Chinese Internet Protocol address.
A simultaneous outage of major South Korean bank computers has prompted speculation of a cyberattack.
After a delegation with Google, HP, Intel, and Microsoft, the company aims to develop communications tech in the Southeast Asian country.
Foreigners will soon be able to tweet, Skype and surf the internet from their mobile devices as the country further relaxes controls on communications.
