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A Subscriber Access License (SAL) is one of the options for licensing Microsoft software under a subscription model. A SAL is required for each unique USER or DEVICE accessing a Microsoft product. A SAL is not a concurrent license and hence cannot be shared amongst multiple users or devices. Multiple users can access through a single device, or multiple devices can be used by a single user, however you cannot aggregate concurrent users through a single device ? individual user SALS are required. Non-concurrent users through a single device is allowed.