In February 1993, the University of Minnesota announced that it would charge licensing fees for the use of its implementation of the Gopher server.[10][2] Users became concerned that fees might also be charged for independent implementations.[11][12] Gopher expansion stagnated, to the advantage of the World Wide Web, to which CERN disclaimed ownership.[13] In September 2000, the University of Minnesota re-licensed its Gopher software under the GNU General Public License.[14] Gopher client functionality was quickly duplicated by the early Mosaic web browser, which subsumed its protocol.