Site publications (excepting those in the Library) are published exclusively with the author's agreement. Once published articles become the common property and in general can't be withdrawn afterwards. The Forum applies technical limitations to restrict altering of the content by the post author shortly after the publication.
Library articles are mostly reprints with specification of the origin (document location at the time of reprinting). Withdrawal of article origin does not imply its withdrawal from the Web-site of KSPA.