You type your name as the maker of the source or header file, why would you want more than that o.O? And I don't think any company would erase that, unless they really don't like you or something :P
But if you're afraid of the company just stealing your code, then I'd guess you're not trying to get into a friendly workplace, in that case, I'd recommend you don't even try get in, 'cause unfriendly work places drain your soul and you're gonna walk depressed for the rest of your life