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+How to (not) use GPL Software
+Derivative Works
+
+What is a derivative work?
+Not dependent on any particular kind of technology (static/dynamic linking, dlopen, whatever)
+Even while the modification can itself be a copyrightable work, the combination with GPL-licensed code is subject to GPL.
+As soon as code is written for a specific non-standard API (such as the iptables plugin API), there is significant indication for a derivative work
+This position has been successfully enforced out-of-court with two Vendors so far (iptables modules/plugins).
+
personal git repositories of Harald Welte. Your mileage may vary