/usr/share/gtk-doc/html/ is in gstreamer0.10-plugins-ugly-doc 0.10.18.3-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/
/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/ch01.html
/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/ch02.html
/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/gst-plugins-ugly-plugins-0.10.devhelp2
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/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/gst-plugins-ugly-plugins-amrnbenc.html
/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/gst-plugins-ugly-plugins-amrwbdec.html
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/usr/share/gtk-doc/html/gst-plugins-ugly-plugins-0.10/up.png