SIP is not a commercial product and is released on a different license than PyQt.
>From the SIP docs (http://www.river-bank.demon.co.uk/docs/sip/sipref.html#license) 1.1 License SIP is licensed under the same terms as Python itself. SIP places no restrictions on the license you may apply to the bindings you create. On a side note.. there will be a GPL edition of PyQt sometime in the future. http://www.riverbankcomputing.co.uk/pyqt/roadmap.php -- http://mail.python.org/mailman/listinfo/python-list
