/usr/share/doc/texlive-pictures/README.source is in texlive-pictures 2013.20140215-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/texlive-pictures/../texlive-base/README.source
/usr/share/doc/texlive-pictures/../texlive-base/README.source