doc.silverstripe.org/sapphire/forms/ReadonlyTransformation.php

<?php
/**
 * Transformation that will turn a form into a readonly version of itself
 * @package forms
 * @subpackage transformations
 */
class ReadonlyTransformation extends FormTransformation {
	// All of the ReadonlyTransformation's functionality is implemented in performReadonlyTransformation()
	// methods on the individual FormField objects.	
}

?>