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Microsoft Sharepoint 2019 Standard User Client Access License
Microsoft SharePoint 2019 User Client Access Licenses (CALs) are required to access Microsoft SharePoint Server 2019 directly or indirectly for content limited to internal use—that is, not available to external users.
Microsoft SharePoint 2019 Standard User Client Access Licenses features access to the core capabilities and features of SharePoint:
Sites
Communities
Content
Search (excluding FAST Search)
Composites (excluding Access Services and InfoPath Services)