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I believe you miss the whole payment point here. XOOPS is a free product for all to use, irrespective whether it is a commercial or non commercial company.
All the developers do this in their own free time and receive no payment and we do not expect any payment either.
Everyone has the right to remove any link back to XOOPS and can modify their site the way they wish to do so. But, as Herko stated, you must leave all information/comments within the php files themselves or you will be breaking that agreement.
We do not force anyone to contribute toward XOOPS money wise or in any other way (rumours are going about thou
) But you can if you want too and only if you want too.
Hope that clears this up