I wrote an Excel form, which I found very expensive. Is it specially locked or stolen by someone else. How can I write a copyright ownership?

This is still difficult to obtain evidence. First of all, you have to prove that the contents of this form are original and have not been used anywhere, let alone authorized by others. The most important thing is that you have no place to apply for patent protection for this kind of thing. After all, the platform of office belongs to Microsoft, and everyone has the right to use it. In the future, you can only pay attention to setting the password more strictly, and don't display it easily.