/usr/share/doc/tomcat6-user/changelog.Debian.gz is in tomcat6-user 6.0.39-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/tomcat6-user/../libtomcat6-java/changelog.Debian.gz
/usr/share/doc/tomcat6-user/../libtomcat6-java/changelog.Debian.gz