Some SSL products secure one domain name, but in 2 options: with and without WWW prefix. This free option is available just for a few certificates.
For several Internet users a domain CertyfikatySSL.pl and the name with WWW prefix www.CertyfikatySSL.pl may be the same internet name. However, the DNS system, responsible for recognizing Internet addresses, treats them as a 2 different domains. Security of this 2 domain versions is very important when user types the address of the website by himself and we can't be sure which version will be chosen.
Just a few SSL certificates have an option to secure both types of 1 domain: the main one and with WWW prefix. From our offer this option is free for standard certificates issuing by 3 vendors: Comodo, RapidSSL and GeoTrust. It does not include the wildcard, multi-domain and UC types.
How to secure 2 domains for the price of 1?
If you run a online business, you are sure to use Google AdWords. Perhaps this is one of the main traffic sources on your site, so the last message you want to see is "Your account has been suspended ...". And yet, you can expect it if your site is not SSL-secured.
Starting 1st of August 2016, Comodo and DomenySSL will no longer offer SGC variants of certificates. As your account has a valid SGC certificate which will be up for renewal in the future, the company has prepared a list of recommended alternatives.
Thawte is only one of the few vendors outside of the United States. As the main competitor of American vendors quickly gained a 40 % share of the market SSL certificates.