This is a useful presentation detailing the licensing of lots of different hosting scenarios. Partner Hosting is the main focus and there are slides on dedicated hosting, hybrid hosting, and shared hosting.
Everything is scenario-based and you’ll find examples with Licence Mobility through SA, the RDS User CAL Extended Rights, and the more mind-bending multiple-partner SPLA situations.
There’s also a section on some options for Volume Licensing customers who want to license external users for web workloads or self-hosted ISV applications. http://bit.ly/1lrQUYV.