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Hacking → Protect Yourself
Use a no-right-click script.
This prevents viewing of the source from the top of the page. Note: This can be circumvented by using browser history.
Encrypt the frames page.
Encryption can stop hackers altogether. By using multiple encryption programs sources become unreadable. Note: Even encryption can be beaten.
As you can see none of these methods are fool-proof. If you are serious about protecting your code, but don't want to spend lots of money, and can use PHP, check out FreeLock PHP Encoder.