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The straight forward answer is you just cant do it!
Whatever you do, a determined user with only basic browser skills can get the content off the page.
Anti-Right clicks, just don't work, people just save the page. pdf formats is the best protection I know, but people can still save ther page and transcribe the text.
I have seen very nifty encryption scripts that prevent material being downloaded or scrambled, but once people know this they can use an image capture tool to 'photograph' the page while they view it. This can then be printed or run through a OCR scanner to return the image back to digital text.
It'goes with the territory of internet usage, Im afraid