Centre/SIS is “free” software released under the GNU General Public License version 2. A copy of this license is included with Centre SIS, and it can also be found at http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
Nobody should be restricted by the software they use. The GNU General Public License is intended to guarantee the users’ freedom to run, copy, distribute, study, change and improve the software. When a program offers its users all of these freedoms, it is called free software (as in “free speech”, not as in “free beer”).
Releasing Centre under the terms of the GNU GPL ensures it will stay free software, no matter who changes or distributes the program. This is called copyleft: the software is copyrighted, but instead of using those rights to restrict users like proprietary software does, we use them to ensure that every user has freedom.
So, in summary:
- Centre SIS is licensed under the GNU GPL and distributed in source code format,
- you may freely download the software, change it and use it for any purpose you see fit,
- you may distribute or redistribute the software, and eventually charge a fee for this service,
- if you release a modified version of the software to the public, you MUST make the source code of this modified software available under the same license terms as the original software,
- you may NOT adapt, modify or delete any copyrights to the software or the license under which it is distributed.
Extensions to the Centre SIS software such as additional modules, integrations or templates that you might write are not covered by the GNU GPL and might be released under whatever license you choose.
You are encouraged to refer to the Frequently Asked Questions about the GNU Licenses for more information.