/usr/share/doc/tomcat6/README.Debian.gz is in tomcat6 6.0.45+dfsg-1~deb7u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/tomcat6/../tomcat6-common/README.Debian.gz
/usr/share/doc/tomcat6/../tomcat6-common/README.Debian.gz