Except as outlined in the PUR, all server/CAL products require a CAL for each user or device that accesses any instance of the server software. Two types of CALs are Device CALs and User CALs.
- Device CAL. Licenses a device for use by any user to access instances of the server software on licensed servers.
- User CAL. Licenses one user to use any device to access instances of the server software on licensed servers. CALs are version- and functionality-specific. They must be the same version or later than the server software being accessed.
You can deploy network architectures that use hardware or software to reduce the number of devices or users that directly access the software on a server. This is referred to as multiplexing or pooling. This does not reduce the number of CALs required to access or use the server software. A CAL is required for each device or user that is connected to the multiplexing or pooling software or hardware front end.