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User CAL.

A SQL Server User CAL is required in order for a user (employee, customer, partner, and so on) to access or use the services or functionality of Microsoft SQL Server. The Server plus user CAL model will likely be more cost effective if there are multiple devices per user (for example, a user who has a desktop PC, laptop, PDA, and so forth).

A CAL is not software; it is a legal document granting a device or user access to server software. A single device CAL grants access to multiple servers for one device (CAL must be same version as latest version of any of the servers). A single user CAL grants access to multiple servers for one user.
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