Function Set-ReadOnlyFTP
{
Param ($FTPUsername, $ACLRule, $Path)
 
    If ($ACLRule -eq "ReadOnly")
    {
	    $Account = New-Object System.Security.Principal.NtAccount("$FTPUsername")
	    $ACL = Get-Acl -Path "$Path"
	    $Permission = "$Account","ReadAndExecute","ContainerInherit,ObjectInherit","None","Allow"
	    $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule $Permission
	    $ACL.SetAccessRule($AccessRule)
            $ACL | Set-Acl "$Path"
    }
 
    If ($ACLRule -eq "Modify")
    {
	    $Account = New-Object System.Security.Principal.NtAccount("$FTPUsername")
	    $ACL = Get-Acl -Path "$Path"
	    $Permission = "$Account","Modify","ContainerInherit,ObjectInherit","None","Allow"
	    $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule $Permission
	    $ACL.SetAccessRule($AccessRule)
            $ACL | Set-Acl "$Path"
    }
}