MSDN related links

Unlimited Dev & Test Enviroments with MSDN Subscriptions

https://blogs.msdn.microsoft.com/govdev/2012/04/18/unlimited-dev-test-enviroments-with-msdn-subscriptions/

MSDN Pricing https://www.visualstudio.com/products/how-to-buy-vs

About the SQL Server License Terms 

https://msdn.microsoft.com/en-us/library/ms143522(v=sql.120).aspx

Quite good paper on SQL Server 2012 with links at the end
https://www.directionsonmicrosoft.com/licensing/2013/06/licensing-sql-server-development-and-test



Licensing SQL Server Dev/Test Environments
http://www.sqlservercentral.com/blogs/nebraska-sql-from-dba_andy/2012/07/27/licensing-sql-server-devtest-environments/

Practices & Pitfalls of MSDN Subscription Licensing