The DOT was later rendered obsolete and was replaced by an online database which was based largely on voluntary input from occupation incumbents (people who have direct experience working in each occupation). This new occupational database was called the Occupational Information Network or the O*NET. The last government-published version of the D-O-T was published in March 1999 as two volumes with additional information related to the O*NET database. . Copies of the DOT published after March 1999 are not originals. They are reprints by commercial publishers, several of which reprinted the book under very similar titles, taking advantage of a very limited copyright which did little to protect the title "Dictionary of Occupational Titles" and did nothing to protect most of the content of the D-O-T.