I changed the file security on the Calendar.php, config.inc.php, and the license.php and in the setup manager I still show they are all still unsecured.
Some servers can't be set to say that the files are secure. Basically, the test is if the web service can write to the file it's considered insecure. You might have to set the security to 444, or as an alternative, you can add a variable in the config.inc.php to hide the warning.
Add
PHP Code:
$EPC_hideSecurity=1;
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