Quote 1:For On Premises, intranet sites are licensed using a Server/CAL (Client Access License) model. SharePoint Server 2016 is required for each running instance of the software, and CALs are required for each person or device accessing a SharePoint Server.
Quote 2:In SharePoint 2016, for extranet and Internet sites scenarios, no CALs are required for external users. External users means users that are not either your or your affiliates’ employees, or your or your affiliates’ onsite contractors or onsite agents.SharePoint 2013 customers with Software Assurance (SA) can leverage Volume Licensing downgrade rights to run SharePoint 2013 bits with SharePoint 2016 use rights.
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