I'm far from a SPLA expert,but I was reading the following:
Service Providers - Microsoft
Processor License (CPU)
When licensing via the CPU licenses, an unlimited number of end users can use the software running on a single CPU for each CPU license acquired. Some products are not available to be licensed in the Processor mode. Benefits of the Per CPU Model include:
* CPU licenses are easier to monitor and count, which lowers the service provider's administrative costs.
* CPU licenses replace Internet Connector licenses, eliminating the need to distinguish between Internet, intranet, and extranet users.
* CPU licenses are economical across a variety of business scenarios where the utilization of the software may vary.