In addition to that legal requirement, there are some strong recommendations that aren't legally required. You should make it clear to your users that you are using Swish-e in your product by listing Swish-e in your documentation and, if you have a web site, with an easy to find link on your web site. (Consider using the Swish-e logo). You must feel guilt if you add features or bug fixes to the software and do not inform other users of swish-e via the Swish-e discussion list, and you should think about buying the developers a beer. Or two. Or until they say 'stop'.
Smile :)
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