http://www.gnu.org/copyleft/gpl.html I was wondering if someone could please clarify the GNU GPL for me, as I'd like to offer paid services for a PHP script released under this license. I understand that I can re-distribute the code freely with the proper credits. But would I be able to offer paid script/installation services legally? Thanks
If you are offering private work then its fine. For example people charge to design wordpress themes. Wordpress is free software. Another example is presta shop, its free and open source content under the same license, coders and designers still offer services for coding themes and 'consultation' or 'technical assistance'. As long as you include the credits accordingly I don't see you having any issues.