Say I have an SSL Certificate for a super cool site that I offer, like https://secure.coolsite.com/ (Not my site, just an example). Then lets say I had a customer who wanted to have a CNAME to my site on his server, like https://mycoolsite.his-site.com/ Would he need a regular SSL certificate on his end, would I need to have a second certificate on my end (And just "install" it on my webserver), or would I need a multi-domain SSL certificate, or he just has to list my site as an alias on his certificate? Thanks!