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Can I use gplv3 in commercial software?
Use the code for commercial purposes: Like GPL v2, GPL v3 imposes no conditions on the internal use of the software. Distribute copies or modifications of the code: As long as these modifications are also released under the GPL v3 license, they can be distributed to others.
Can open source software be resold?
Absolutely. All Open Source software can be used for commercial purpose; the Open Source Definition guarantees this. You can even sell Open Source software.
Should I use the GPL or a more permissive license?
Using the GNU GPL will require that all the released improved versions be free software. This means you can avoid the risk of having to compete with a proprietary modified version of your own work. However, in some special situations it can be better to use a more permissive license.
What is the difference between redistribute and distribute in GPL?
Redistribute in the GPL means that you can modify a piece of Free Software and make it available on public domain. There is no difference between redistribute and distribute, the first one is just the repetition of the second one.
Can You incorporate GPL-covered software into a proprietary system?
You cannot incorporate GPL-covered software in a proprietary system. The goal of the GPL is to grant everyone the freedom to copy, redistribute, understand, and modify a program. If you could incorporate GPL-covered software into a nonfree system, it would have the effect of making the GPL-covered software nonfree too.
Is it legal to distribute GPL programs on non-GPL OS?
We can force such rules in the jungle, but in real life (juridical of country or state) it depends on who, whom, when and what. The legal problem (law) raise when you do an act of distributing GPL program as binary or library on non GPL OS.