how to disallow downloading data from a particular website(i.e.)?

Answer 1

If you run your own DNS server, you can simply point the DNS for that domain to a private IP address or to another website (that's what we do at our company).

You can also program most routers to filter out traffic to a particular domain or IP address.

Answer 2

there are java scripts called no right click scripts that keep people from right clicking on your site there are links at http://www.davidspages.org/ to sites where you can download scripts for free good luck