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can i use GNU GPL software (joomla na its extensions) on commercial project

By spirytuspl ·
I?m developing site for a client based on joomla and community builder. I?ll be paid money (hopefully) however I want to make sure that what I do is legal. Joomla and community builder are developed under GNU GPL and so my question is if I can charge money for what I do. I also want to remove Joomla ?powered by joomla? and this annoying ?about community builder? option from CB profile menu. Furthermore I need to put probably at the bottom of the screen information saying ?developed and maintained by heregoesmyname?. However all the internal comments (php and all server side stuff) and copyrights will stay the same, as I said with exception of those in html files which are getting downloaded into clients computer. Is it ok or am I breaking some laws? Thank you in advance for your help.

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read the license

by The Scummy One In reply to can i use GNU GPL softwar ...

to be safe.

But from my understanding, you can alter the SW and even provide support (paid), but you also have to offer the source code.
But, I am really NOT an expert on this. The safest way to deal with this is to get an attorney to review/consult. It shouldnt cost much, and they will have much better info.

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it's simple..

by Jaqui In reply to read the license

"Preamble

The GNU General Public License is a free, copyleft license for
software and other kinds of works.

The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.

When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish)
, that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things."

directly from the GNU-GPL
http://www.gnu.org/licenses/gpl-3.0.txt

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simple answer

by Jaqui In reply to can i use GNU GPL softwar ...

yes you can charge for setting it up and adding content, BUT, since joomla is under the gnu-gpl any code changes MUST be under the GNU-GPL and be MADE AVAILABLE to anyone who wants them.

edit to add:

The powered by is not required by the GNU-GPL, nor by the Joomla team, check the community builder site to see if they require the attributation.

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