I just saw the commercial redistribution clause for pdfTK if that&#x27;s what you&#x27;re talking about.  It does not affect me since this was not a commercial application, but it would seem to me that that clause itself is a violation of the GPL, since pdfTK links to GPL software and it is also a contradiction of a separate place on the site that claims the same software is licensed under the GPLv2.  Preventing commercial redistribution is not compatible with the GPL.