Disabling authoring information in Omega 3.x does not work from content type; how can I disable it?
Don't know how exactly it looks in your Omega theme, but in Zen you just remove/change the following snippet in templates/node.tpl.php (or templates/node--content_type.tpl.php):

&lt;?php if ($display_submitted): ?&gt;
  &lt;div class="submitted"&gt;
    &lt;?php print $submitted; ?&gt;
  &lt;/div&gt;
&lt;?php endif; ?&gt;


In Bartik it's equivalent would be:

&lt;?php if ($display_submitted): ?&gt;
  &lt;div class="meta submitted"&gt;
    &lt;?php print $user_picture; ?&gt;
    &lt;?php print $submitted; ?&gt;
  &lt;/div&gt;
&lt;?php endif; ?&gt;