Mark the fields read only in your field settings like normal, and then conditionally disable it with this function. Include readonly='administrator' in your [ formidable] shortcode, and use this example to process it.

Use the code below to set a custom value in a repeating field. Replace 508 with the ID of the repeating section field. Replace 11700 with the ID of the field that you want to modify.

It checks to ensure that no special characters are in the values inputted by the form user.

It was developed to detect and prevent special characters being added to the database.

It was needed to support the Comprehensive Google Map plugin, as that plugin does not like having non-alpha-numeric characters in any field it is displaying. The plugin is here: http://wordpress.org/plugins/comprehensive-google-map-plugin/

If you have dev / test / staging / production instances of WP, be sure to use the production form IDs in your production functions.php.