/usr/ is in ruby-rack-openid 1.3.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rack/
/usr/lib/ruby/vendor_ruby/rack/openid.rb
/usr/lib/ruby/vendor_ruby/rack/openid/
/usr/lib/ruby/vendor_ruby/rack/openid/simple_auth.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rack-openid/
/usr/share/doc/ruby-rack-openid/copyright
/usr/share/doc/ruby-rack-openid/changelog.Debian.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/rack-openid-1.3.1.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/rack-openid-1.3.1.gemspec