Sometimes you may want to make the database child information fields read-only. Here's a simple way of doing it, using javascript injection into the custom field's description:
You should add the following javascript code into the dbcf child field description from the field’s configuration:
<script type="text/javascript">
document.getElementById('customfield_xxxxx').readOnly=true;
</script>
,where customfield_xxxxx is the the id of your dbcf child custom field. You can see the cf id as parameter in the URL when editing its configuration (eg '.../secure/admin/EditCustomField!default.jspa?id=10701'):
That's it. Your database child field will now be read-only on all screens.