/usr/share/doc/libvtk6.3-qt/changelog.Debian.gz is in libvtk6.3-qt 6.3.0+dfsg1-11build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libvtk6.3-qt/../libvtk6.3/changelog.Debian.gz
/usr/share/doc/libvtk6.3-qt/../libvtk6.3/changelog.Debian.gz