/usr/lib/python2.6/dist-packages/zope/cachedescriptors/README.txt is in python-zope.cachedescriptors 3.5.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/zope/cachedescriptors/../../../../../share/pyshared/zope/cachedescriptors/README.txt