I've a site in x languages and each language has its own domain and language like

www.mycompany.de, www.mycompany.co.uk, www.mycompany.at, ....

Currently, I can force another language - e.g. German on the English site - on any of the sites like this: wwww.mycompany.co.uk?sc_lang=de-DE.

I want to prevent this.

Also, Sitecore's URL resolver will also recognize other Display Names for an item. So for instance I can go www.mycompany.de/about-us on the German site, where only www.mycompany.de/ueber-uns should be allowed.

Is there one setting I just need to activate and this works out of the box? If not, what is the solution here?