I have a lot of customized javascript and layout design, and I want to prevent people from using those. Is there any practical way to do this, or do I basically just have to be happy my php code does not show? I want to at least make it difficult to copy my site.
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If people really want to get access to your source code they can do that fairly easily.
It is possible to slow people down to a limited degree by obfuscating code.
See:
Maintaining obfuscated code is difficult. What you want to do is obfuscate it before deployment so that you can test and debug with the normal version. Debugging problems on a live site can be made a lot more difficult by the obfuscation.