Payment module license issue

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Hi,

here in Spain the main payment system is 4B. I know various people have made a payment module for this system. They sell this with the osC installation and customization. I know this is not a GPL violation. But my question is the following:

Should they release the payment module code to the public? They make a redistribution of a code that I think must be covered by GPL, 'cause is used in conjuntion with a core GPL system, and is useless if you separate them. And if this code is GPL and they redistribute it, they are required to make it public (I understand this in the GPL license)

This question is a trouble here in Spain, and I'd like to know if I'm right to ask payment module creators to release it under the terms of the GPL. Now I'm making a GPL payment module, that I'll release in a week or two, but I'd like to see if the solution of other people is better or if I could improve that...

Thanks a lot