There is a license approved by the OSI, the ISC License [1], which should be included in the PyPi classifiers [2].
[1] https://www.isc.org/software/license http://www.opensource.org/licenses/isc-license.txt [2] http://pypi.python.org/pypi?%3Aaction=list_classifiers -- http://mail.python.org/mailman/listinfo/python-list
