The South suspended operations at the industrial complex in February last year, saying that money Pyongyang made from the venture was going towards its nuclear weapons programme.
An association representing the 120 South Korean firms operating factories in Kaesong, which lies just across the North Korean border, estimated the value of the assets left behind at 820 billion won ($663 million).
Today, North Korean media outlets confirmed joint-run factories were still running and that plants left by the South could no longer be considered their assets.
The article added that Pyongyang would freeze all facilities, products and materials left by the South and eventually control and manage them.
"No matter how fiercely the US and its cronies may attempt to intensify sanctions, they can never stop us moving forward and the plants in the industrial zone will churn out all the more actively," it said.
Another North Korean online propaganda site, Arirangmeari.com, said the plants left by the South had been forfeited.
The announcement followed news reports that North Korea has been using Seoul-invested facilities at 19 factories to produce clothes in Kaesong.
North Korea is subject to a multiple layers of international sanctions over its pursuit of nuclear and missile programmes.
In response to the announcement, an official at Seoul's unification ministry told Yonhap news agency: "North Korea must not infringe upon property rights of South Korean companies".
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