One solution is to encrypt the web page code. A web search will reveal plenty of tools to accomplish this; one that I’ve tried is iWebTool.com HTML Encrypt. It’s easy to use, just paste your raw code into the text entry box, click the “Encrypt” button and see your encrypted code in the lower panel.
It’s not a substitute for secure coding, but it can serve as an effective deterrent.
Comments? Go ahead and hit the button.