/usr/share/help/C/system-admin-guide/lockdown-file-saving.page is in gnome-user-docs 3.28.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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xmlns:its="http://www.w3.org/2005/11/its"
type="topic" style="task"
id="lockdown-file-saving">
<info>
<link type="guide" xref="user-settings#lockdown"/>
<link type="seealso" xref="dconf-lockdown" />
<revision pkgversion="3.11" date="2014-10-14" status="candidate"/>
<credit type="author copyright">
<name>Jana Svarova</name>
<email>jana.svarova@gmail.com</email>
<years>2014</years>
</credit>
<credit type="author copyright">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
<years>2014</years>
</credit>
<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
<desc>Prevent the user from saving files to disk.</desc>
</info>
<title>Disable file saving</title>
<p>You can disable the <gui>Save</gui> and <gui>Save As</gui> dialogs. This
can be useful if you are giving temporary access to a user or you do not want
the user to save files to the computer.</p>
<note style="warning">
<p>This feature will only work in applications which support it! Not all
GNOME and third party applications have this feature enabled. These changes
will have no effect on applications which do not support this feature.</p>
</note>
<steps>
<title>Disable file saving</title>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user-dir'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<item>
<p>Create the key file
<file>/etc/dconf/db/local.d/00-filesaving</file> to provide
information for the <sys>local</sys> database.</p>
<listing>
<title><file>/etc/dconf/db/local.d/00-filesaving</file></title>
<code>
# Specify the dconf path
[org/gnome/desktop/lockdown]
# Prevent the user from saving files on disk
disable-save-to-disk=true
</code>
</listing>
</item>
<item>
<p>To prevent the user from overriding these settings, create the file
<file>/etc/dconf/db/local.d/locks/filesaving</file> with the following
content:</p>
<listing>
<title><file>/etc/dconf/db/local.db/locks/filesaving</file></title>
<code>
# Lock file saving settings
/org/gnome/desktop/lockdown/disable-save-to-disk
</code>
</listing>
</item>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-update'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-logoutin'])"
xmlns="http://www.w3.org/2001/XInclude"/>
</steps>
</page>
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