There is absolutely no need to be shy about code. If it works, it’s good! You’d wonder how people sometimes change their mind from “bad code” to “good code” once they actually use the program.
If you speak about hiding as in obfuscating in context of copying games in binary form, then there is no real solution and you shouldn’t really care until you earn serious money with your game. Milion-heavy publishers try making their games copy-safe and spend much money and time for that - the result is a new one-week-challange for a cracker and a new entry on file sharing sites.
Most projects die not because of opponents copying code, but because of not finishing anything. And one reason people don’t come up with anything is caring about things like this instead of concentrating on what’s important.