Making It Read-Only
If you keep your Publisher files on a network drive or others have access to your publications, you can prevent changes to these files by making them read-only. Doing so is quite simple. All you have to do is locate the file on your computer or network drive. Do not open the file. In fact, if you already have the file open, you must close it in order to make it read-only.
Right-click the Publisher file and select Properties. The Properties dialog for that publication opens. Make sure you are on the General tab of the dialog box. Select the Read-Only check box next to Attributes and then click OK.
When someone opens the file, it will open in Publisher just as it did before. In fact, anyone who opens the file can still access all of the objects in the file to move, delete or otherwise modify them. If someone makes changes, however, and then attempts to save the file, they will be unable to do so. Instead they receive an error message that states, "This file is set to read-only. Try again with a different file name."
If your only concern is someone making changes to your original file, this option is sufficient. Other users can still change the file and simply save it with a new file name if they require a modified version. Likewise, you or any other user can easily remove the read-only setting by reopening the Properties dialog and clearing the Read-Only check box.
On the other hand, if you are looking for a way to prevent others from altering your unique publication and using it as their own, this method is not enough. You will need to save the file in another format either using Publisher's built-in options or with third-party software.