How to make a copy of file as Readonly?
<p>I am exporting the date to an Excel spreadsheet programatically in a Windows Forms Application. When I am saving the Excel file, I am marking that file as read only. If the user creates a copy of Excel file,then they can modify it, but I want to restrict the cloning(Dont allow duplicate copies) and if there is a copy of file also,I want to make that also read only.</p>

<p>I don't want to use any passwords.<br>
Is this possible to do?</p>

<p>Thanks in advance</p>
