/usr/share/pyshared/sphinx/builders/ is in python-sphinx 1.1.3+dfsg-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/sphinx/builders/__init__.py
/usr/share/pyshared/sphinx/builders/changes.py
/usr/share/pyshared/sphinx/builders/devhelp.py
/usr/share/pyshared/sphinx/builders/epub.py
/usr/share/pyshared/sphinx/builders/gettext.py
/usr/share/pyshared/sphinx/builders/html.py
/usr/share/pyshared/sphinx/builders/htmlhelp.py
/usr/share/pyshared/sphinx/builders/latex.py
/usr/share/pyshared/sphinx/builders/linkcheck.py
/usr/share/pyshared/sphinx/builders/manpage.py
/usr/share/pyshared/sphinx/builders/qthelp.py
/usr/share/pyshared/sphinx/builders/texinfo.py
/usr/share/pyshared/sphinx/builders/text.py
/usr/share/pyshared/sphinx/builders/websupport.py