hook_field_access always FALSE

content.module's content_access returns FALSE when it comes across the first hook_field_access === FALSE.
this prevents other modules from permitting access.
instead you must enable everyone to have access, then create modules to prevent access - which is opposite to drupals 'deny unless permitted approach'.

for example access is always denied unless a hook_node_access_records === TRUE.

2257 - 2262 of content.module should probably be changed to:-

  foreach ($access as $value) {
    if ($value === TRUE) {
      return TRUE;
    }
  }
  return FALSE;

this change allows modules to permit access to cck fields using hook_field_access.