You can't add a password to the document you want to generate. The Writer only creates PDF files with all the restrictions removed. You will need a fully capable PDF editor in order to assign a password and modify restrictions.
If you choose to use the same application from this developer, then you should know that the Professional version allows you to password-protect your documents. This feature is mentioned on the font page of the application: http://www.cutepdf.com/products/cutepdf/pro.asp
Quote: "Add Passwords and Set Security Options to Protect Your Valuable Documents".
