+defusedexpat protects the XML packages of Python's standard library from
+several denial of service vulnerabilities and external entity exploits. It
+* a modified and enhanced version of expat parser library
+* replacements for pyexpat and cElementTree's _elementtree extension modules
+* loader code that replaces built-in extensions with the modified extensions
+* monkey patches for xml.sax and xml.dom to prevent external entity expansions
+In order to protect your application you have to import the ``defusedxml``
+module **before** any of the stdlib's XML modules.
+* limited entity expansion level to antagonize billion laugh attacks
+* limited total length of expansions to prevent quadratic blowups
+* monkey patch to prevent retrieval of external entities and DTDs
+Copyright (c) 2013 by Christian Heimes <email@example.com>
+Licensed to PSF under a Contributor Agreement.
+See http://www.python.org/psf/license for licensing details.
+Antoine Pitrou <firstname.lastname@example.org>