Password protecting my documents

Hi everyone,

I'm using adobe acrobat pro, and have used the security feature to password protect the file to restrict editing.

Basically, I don't want anybody copying my work.

But even when I do that, all I have to do is make a copy of the document and all the restrictions are removed for that document.

Is there a better/easier way to stop others from editing/copying my work?

Any advice would be greatly appreciated.

Thanks