If you don't care about alerting the user with a message every time they try to right click, try adding this to your body tag
<body oncontextmenu="return false;">
This will block all access to the context menu (not just from the right mouse button but from the keyboard as well)
However, there really is no point adding a right click disabler. Anyone with basic browser knowledge can view the source and extract the information they need.
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