Gracias, Wikipedia.
Proyectos::ShellAjax::Licencia de uso
Permalink: http://www.treeweb.es/u/1101/ 17/06/2011

Licencia de uso

Inicialmente se pensó como una forma práctica de probar un prototipo de comunicación instantánea servidor -> cliente pero parece que ahora podría tener cierta utilidad.

Es por eso que el código está publicado bajo licencia GPL.
This file is part of ShellAjax. ShellAjax 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 3 of the License. ShellAjax 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 Foobar. If not, see <http://www.gnu.org/licenses/>.