Extend Python

[Ravi Teja]

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