silverstripe-cms/code/Forms/SiteTreeURLSegmentField_Readonly.php

<?php

namespace SilverStripe\CMS\Forms;

/**
 * Readonly version of a site tree URL segment field
 */
class SiteTreeURLSegmentField_Readonly extends SiteTreeURLSegmentField
{
	protected $readonly = true;

	public function performReadonlyTransformation()
	{
		return clone $this;
	}
}