User CALs are required for every User that accesses the database, regardless of the devices that are being used such as a mobile phone, work computer, and home computer.
Applies to SQL Server Editions: Standard & Enterprise.
MS SQL Server 2017 User CALs allow for a User to access the SQL Database no matter the devices they're using. User CALs are more cost effective if each User needs to access the server from different work stations, locations, or devices.
If you need to have external users such as a contractor accessing the database, you will need to purchase a User CAL for each contractor. These CALs can then be moved to another contractor when they are no longer on the job.
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