<page xmlns="http://projectmallard.org/1.0/"
    type="topic"
    id="mask">
<info>
    <link type="guide" xref="edit#ops"/>
    <desc>The permission mask allows to revoke permissions without changing the ACL entry.</desc>
</info>

<title>Permission mask</title>

<p>
ACL entries imply an additional entry called <em>mask</em>. The mask
defines effective permissions that can have user entries (except for the owner),
group owner and group entries.
</p>

<p>
If the mask disallows a permission to be effective <app>MATE Eiciel</app> puts an exclamation
mark next to the uneffective permission.
</p>

<figure>
	<title>Permission mask example</title>
    <media type="image" src="figures/mask_detail.png" />
</figure>


</page>
