According to the article, the four principles were agreed; 1) One should understand another's claim to Dokdo/Takeshima and would not object to the refutation to the claims, 2) As to a future fishery zone, both of the countries draw the lines first including Dokdo/Takeshima into own territories, and then the duplicated area should be decided as a common zone, 3) Continue the status quo under Korea's occupation but Korea would not increase guards and would not build a new building or enlarge the building, 4) Both of the countries will keep the agreement continuously.
In conclusion, these principles were made to consider that the dispute was resolved without resolving the matter (解決せざるを以て解決したものと見なす).
But the President Kim Yong-san 金泳三 broke the agreement and built new pier facilities. Since then, the dispute became apparent again.
According to the article, they would publish a book concerning this matter in Japan first and then, Korean version would follow.
And in October 2008, Japanese version of the book "竹島密約 (The Takeshima Secret Pact)" , written by Roe Daniel, was put on sale 19 months after the article.http://www.amazon.co.jp/%E7%AB%B9%E5%B3%B6%E5%AF%86%E7%B4%84-%E3%83%AD%E3%83%BC-%E3%83%80%E3%83%8B%E3%82%A8%E3%83%AB/dp/4794216793/ref=sr_1_1?ie=UTF8&s=books&qid=1227513391&sr=8-1
(BTW, I haven't got a copy of the book yet. Are there anybody who already read it?)