http://www.gnu.org/licenses/gpl-howto.html

sayfasında yanlış anlamadıysam lisans yazısını yazılımla beraber dağıtman yeterli.

Burada açıklanmış..

You should also include a copy of the license itself somewhere in the distribution of your program. All programs, whether they are released under the GPL or LGPL, should include the text version of the GPL. In GNU programs the license is usually in a file called COPYING.