Starting from PH Theme we started to provide a built-in content security feature to our customers. This feature disables right click context menu, prevents text selection and makes Ctrl+C/Ctrl+X shortcuts unavailable on your website.
Such set of features should help you to save website content and source code from copying. However, this is not a 100% complete solution. Your visitors still be able to inspect your website content through some special software, but it will require additional skills, so for most visitors, it will work.
Moreover, this feature is browser-dependent so in old or rare browsers like IE6 it may not work or work not as expected.