The bouldering is on private land. According to Norwegian law, no one can deny you bouldering on private land except on agricultural land. However, it is not allowed without permission to freely cut trees or do major changes to the enviroment in order to climb. A privat land owner can also deny parking or charge you for it (within reason). As of 2015 there has been no trouble with any land owner about parking or bouldering.
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From Oslo:Drive south on E-18 until you reach Lillesand (about 400 km).
A good place to camp is Saltvika.