Demo site - block access and Google?

[Mark M]

I'm developing a new site on another domain that I own, it uses the same content from my main site so I'd like to block Google so I dont get punished for duplicated content. Whats the easiest way to do this with Wordpress?

Also, can I somehow password protect the site so that only I can see it? Its unlikely anyone would stumble accross it but as its just a test site no one needs to see it bar me.

Many thanks.