I visited many websites that don't allow visitors to use right-click for anything. I wanted to use something like that in my site too to avoid my content is "copied" without permission.

Do you know how can I do that?

Even if you did that, wouldn't it still be possible to copy the content by going into the page source? It would only stop those who didn't know about how to find the page source.

one can easily copy the text as alex told, but really, i don't like sites which disable right clicking or stop you from doing something that is legal or not harmful to site or anyother thing around internet.
you can check at http://www.linksleader.net/4/Salman-...l-website.html

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simply face the truth that all scripts are exposed codes. no matter how you hash it.

I think it's more about downloading images and other copyrighted material.

Even so. all images (copyrighted or not) are placed in the browsers "Temporary Internet File" directory.

Let's just face the fact that anything that goes to the internet is now public.