Help understanding CAL (Client Access Licensing) requirement in a simple deployment scenario

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hi everyone, 

have question on subject of  windows server cals (client access licensing) , related / similar licensing requirements when comes running multiple windows servers in production , customer facing environment, discussed in link: 

https://www.microsoft.com/en-us/licensing/product-licensing/client-access-license.aspx

please allow me briefly describe extremely simplified version of infrastructure setup: core server roles / components (inclusive of related services) include: 

- 1 "stream server" -> running licensed windows server os version; server hosting proprietary sw , n devices (i.e. 10000) connecting tcp client in order deliver data server; n devices have authenticate accessing , establishing session server; moreover, server multiplexing / collecting n data flows pushed / provided other windows os licensed processing servers (shortly hereafter described); 

- 1 "web server" -> running licensed windows server os version; server host iis - based web server (relying on proprietary sw installed on same server) offering http based access end customers (again, using proprietary sw installed on same server); proprietary sw relay end customers incoming requests 3rd server -> "processing server" ; deliverying results of data processing provided "processing server" same pool of end users. 

- 1 "processing server" -> running licensed windows server os version; server connect stream server retrieve data submitted n devices; @ same time, "web server" collect server; server in charge of processing end customer's requests providing them needed services (indirectly - meaning customers not directly connected server, althought server integral , necessary part of whole end customer data processing , service delivery chain). 
processing server accessing both "stream server" (n data flows sourced sensors / devices) , "web server" (y end customers requests relayed web server server processing). 

according understanding of windows volume licensing, external connectors licenses required @ least "web server" server type - not 100% sure if "stream server" server type should require type (or similar) windows cal licensing. 

thank in advance clarifying.



Windows Server  >  Windows Server 2012 General



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