Hi,
According to European law one has to inform users about setting cookies on visiting a website. In principle I know how to do it in php:

<?php    // Top of the page
$user_not_here_before = !isset( $_COOKIE["YoureNew"] );
    // Set the cookie so that the message doesn't show again
        setcookie( "YoureNew", "No", strtotime( '+1 year' ) );
?>

<?php if( $user_not_here_before ): ?>
    Agree to terms and conditions
<?php endif; ?>

<?php // Next time you're not new anymore. Show cookie or whatever
 echo $_COOKIE["YoureNew"];
?>

I would like to setup this with HTML5 DBSM combined with a modal or notify2.
Is this possible?

Hello,
You can use bootstrap 3 alert, with the "data-show" option, if the "$_COOKIE["YoureNew"]" doesn't exist.
This way the alert will be shown if the user is new, and won't be shown, once thee cookie exists.

Oh thanks,
I did not assume it would be so easy