Posted by: 
Dominique De Cooman

Here is an example on how to obscure email addresse (or other tekst) using in a formatter. You can use it on the cck field overview as a formatter (or in display suite).

//cck formatters
 * Implementation of hook_field_formatter_info(),.
function your_module_field_formatter_info() {
  return array(
'text_as_image' => array(?>

Posted by: 
Dominique De Cooman

How to add another formatter to a cck field? A cck formatter is basically a theming function where the value of field is ran through. Formatters are available at "admin/content/node-type/[your node type]/display" in the cck interface.

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