You see the (c)? That's *your* legal protection against people stealing your code. The GPL only grants people extra rights, which they wouldn't have if only the (c) was there.

Remember, folks, in many places (UK included) a c in brackets has no weight in law. You must either use the real circled c copyright sign, or write the word "Copyright" in full.

(NB IANAL and this is from my training in printed work...)