The Windows CSL enables Bring Your Own Device (BYOD) scenarios for secondary or companion devices, thus providing businesses greater flexibility to run Windows across multiple devices for employees. When attached to a work device licensed with Software Assurance for Windows or Windows VDA, the Windows CSL grants the primary user of that device rights to access a corporate desktop through VDI or Windows to go on up to four additional devices capable of leveraging these technologies. Devices eligible for use under the Windows CSL include any type of personally owned device as well as corporate owned non-x86 devices.
The Windows CSL provides a single license valid for up to four devices instead of requiring individual licenses for each companion device. So all that is required is to license the primary work PCs with SA, and then select the users who will be bringing devices from home and attach the Windows CSL.