/usr/share/doc/ is in hyperestraier 1.4.13-3ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/hyperestraier/
/usr/share/doc/hyperestraier/NEWS.Debian.gz
/usr/share/doc/hyperestraier/README
/usr/share/doc/hyperestraier/cguide-en.html
/usr/share/doc/hyperestraier/cguide-ja.html
/usr/share/doc/hyperestraier/index.html
/usr/share/doc/hyperestraier/index.ja.html
/usr/share/doc/hyperestraier/intro-en.html
/usr/share/doc/hyperestraier/intro-ja.html
/usr/share/doc/hyperestraier/nguide-en.html
/usr/share/doc/hyperestraier/nguide-ja.html
/usr/share/doc/hyperestraier/pguide-en.html
/usr/share/doc/hyperestraier/pguide-ja.html
/usr/share/doc/hyperestraier/uguide-en.html
/usr/share/doc/hyperestraier/uguide-ja.html
/usr/share/doc/hyperestraier/common.css
/usr/share/doc/hyperestraier/THANKS
/usr/share/doc/hyperestraier/README.Debian
/usr/share/doc/hyperestraier/TODO.Debian
/usr/share/doc/hyperestraier/copyright
/usr/share/doc-base/hyperestraier
/usr/share/doc/hyperestraier/changelog.Debian.gz