Can I add an unremovable image to an excel file, for security purposes?

I want to add an image to an excel file that others cannot remove. The assumption would be that there ARE others out that who will get access to the file and desire using it for their own purposes. I do not mind if they use it, but I want people to know where the file originated from no matter how hard they try to plagarize it. A simple unremovable image from the file would be perfect.

I would also like to learn about other security measures I can take to ensure that others know the origin of the work. I am worried that the password protection method is insecure, and could certainly learn more about file protection and sharing.

Good evening rrbest

There's no such thing I'm afraid.
You could place an image anywhere in the file and then use protection.
Or you could use a macro to show a "splash screen" on startup.
Or embed text in a cell and use protection.
Or use the standard file properties.

But all of these can be removed, altered or whatever with really not that much knowledge, with or without other commercial products.

Excel just isn't suitable for such a use I'm afraid.

DominicB