There are two cases when you can have several domain names all pointing to the same website:
1. Domain Alias is a domain name used as an alternative name for another domain. For example, if the primary domain name is "original.com" and a Domain Alias is registered for "alias.com," then “http://www.original.com” and “http://www.alias.com” will take visitors to the same pages of the “original.com” website. Furthermore, http://original.com/somefile.html will bring visitors to the same page as http://alias.com/somefile.html.
2. Domain Forwarding (URL Redirect) allows redirecting web requests for the parked domain name to content hosted on a different server. In the case of Domain Forwarding, when a visitor attempts to access the forwarded domain, the web browser automatically redirects to the specified website.
In both cases, you would NOT need separate Sitefinity licenses for each domain alias/forwarded domain. In the case of domain aliases, please get in touch with us and send us the list of domain aliases so we can generate additional license keys for you. Please note that in order to register a domain alias, you need to have a license with an active support subscription.Prior to issuing the new domain name licenses, you will need to sign an Annex to the Sitefinity EULA. In the case of domain forwarding, it would be sufficient if you generate the Sitefinity license key for the primary domain name only.