Single sign-on (SSO) is an authentication scheme that allows users to login with a single ID and password to more than one application. You login to with your Stanford SunetID, which is the same credential you used to login

Stanford Domains is a service for Low Risk data.  There is no need to protect your website contents. However, if you want ALL of your website content available to only Stanford Community, you can setup Single SingOn for your website. For Medium Risk data, please use Stanford Sites service

Note: WordPrss Plug-ins (in general) only work with content internal to WordPress. Content external to WordPress (external links or static html files) remain uncontrolled by the plug-in.