The C and Python code is licensed under the GPLv3 or later (see COPYING and the
per-file license information).

There are copies of various JavaScript and CSS libraries embedded within the
source tree, which have their own licenses as follows:

  libcpychecker_html/extlib/jquery-1.7.1.min.js: (MIT or GPLv2)

     MIT license

     Public Domain

There are also various images within:
These were taken from:
and are:
  "© 2012 Yusuke Kamiyamane. All rights reserved.
  These icons are available under a Creative Commons Attribution 3.0
  License. "

The test code contains historical examples of reference-count bugs:

  * libcpychecker_html/test/example2
      contains an embedded copy of part of an old version of pylibmc, which
      is under a 3-clause BSD license