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A secure site is a web site that is protected from prying eyes. When information passes back and forth between our server and your computer, all the information is encrypted. That means that if anyone were to 'listen in' and see this data, they will not be able to decrypt or read what it means.
Learnedly uses this security (known as SSL) throughout the site and all its subdomains to make sure that your personal information is not accessible by anyone but yourself.