Copyright headers

Here are some copyright headers you might use in your code:

GPL

/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */
 
 /**
  * Hello world brief.
  *
  * @ingroup Maintenance
  * @author Mark A. Hershberger <mah@everybody.org>
  */
class HelloWorld {
}

CC0

/**
 * To the extent possible under law,  I, Mark Hershberger, have waived all copyright and
 * related or neighboring rights to Hello World. This work is published from the
 * United States.
 *
 * @copyright CC0 http://creativecommons.org/publicdomain/zero/1.0/
 * @author Mark A. Hershberger <mah@everybody.org>
 * @ingroup Maintenance
 */