ProWiki is OpenSource and FreeSoftware.
There are official statements and documents about what that means. Especially the offical GPL license published.
In EverydayLanguage "ProWiki is OpenSource" means:
ProWiki is OpenSource in the sense that you are bound to the GPL license but you are not obliged to altruistic or non-commercial behaviour. You can EarnMoneyWithProWiki and we will be happy to support you.
- you have access to the source of ProWiki and all information to use it for whatever you want
- non-commercial or commercial
- private or public
- you can pass the system to friends or customers, to whomever you want
- you are not allowed to turn it into a closed system, not even if you add features of your own
- you are not allowed to remove the references to its authors and publish it as your origin work.