Add [licensing] and [distribution] tags

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asked Feb 12, 2011 at 11:53

Can I use GPL software in a commercial application

I have 3 questions about the GPL here:

If I use GPL software in my application, but don't modify or distribute it, do I have to release my application under the GPL?
What if I modify some software that my application uses. Then do I have to release my application under the GPL, or can I just supply the modified software under the GPLs terms.
And what if I use GPL software, but don't modify it, can I distribute it with my application?

My case in point is, I have a PHP framework which I use the GeSHi library to highlight some output.

Because GeSHi is GPL, does my framework have to be GPL?
Can I modify GeSHi for particular use cases of my application if I supply the modifications back to the GeSHi maintainers?
Can I redistribute my framework with GeSHi?

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