The hypothetical commands `show w' and `show c' should show the appropriate parts of the General
Public License. Of course, your program's commands might be different; for a GUI interface, you
would use an "about box".
You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright
disclaimer" for the program, if necessary. For more information on this, and how to apply and follow
the GNU GPL, see <http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program into proprietary
programs. If your program is a subroutine library, you may consider it more useful to permit linking
proprietary applications with the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-
not-lgpl.html>.
142