[EnIgMa1234]

Try this.

$blocklist = array_merge($blocklist, array(
    'licenses' => array(
        'class' => 'licenses',
        'title' => 'User Licenses',
        'hook_location' => 'profile_left_last'
    )
));

class vB_ProfileBlock_licenses extends vB_ProfileBlock
{
    var $template_name = 'memberinfo_block_licenses';

    function confirm_empty_wrap()
    {
        return false;
    }

    function confirm_display()
    {
        return ($this->block_data['licenses'] != '');
    }

    function prepare_output($id = '', $options = array())
    {
 $outdata = "<iframe src=\"http://www.mydomain.net/admincp/vbma_admin.php?do=viewuserslicenses&userid=\".$prepared['userid']."\" width=\"100%\"></iframe>";
        $this->block_data['licenses'] = $outdata;
    }
}