Barrapunto

Extraido directamente de la GPL:

For example, if you distribute copies of such a
program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights.

Usease, que si distribuyes software GPL tienes la obligacion de facilitar tambien el codigo fuente o bien la posiblidad de que los clientes puedan obtenerlo, ademas de informarles que lo tienen a su disposicion. Sin que lo pidan.