/usr/lib/python2.7/dist-packages/epydoc/markup/plaintext.py is in python-epydoc 3.0.1+dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/epydoc/markup/../../../../../share/pyshared/epydoc/markup/plaintext.py