/usr/share/doc/python-apt/html/library/ is in python-apt-doc 0.9.3.12.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/python-apt/html/library/apt.cache.html
/usr/share/doc/python-apt/html/library/apt.cdrom.html
/usr/share/doc/python-apt/html/library/apt.debfile.html
/usr/share/doc/python-apt/html/library/apt.package.html
/usr/share/doc/python-apt/html/library/apt.progress.base.html
/usr/share/doc/python-apt/html/library/apt.progress.gtk2.html
/usr/share/doc/python-apt/html/library/apt.progress.text.html
/usr/share/doc/python-apt/html/library/apt_inst.html
/usr/share/doc/python-apt/html/library/apt_pkg.html
/usr/share/doc/python-apt/html/library/aptsources.distinfo.html
/usr/share/doc/python-apt/html/library/aptsources.distro.html
/usr/share/doc/python-apt/html/library/aptsources.sourceslist.html
/usr/share/doc/python-apt/html/library/index.html