The guide gives information about licensing basics and why Microsoft uses different models for licensing its products.
Microsoft Product Use Rights
In this introductory guide to Product Use Rights (PUR), you will learn how you can use the PUR to find licensing information for specific Microsoft products and services. You will also get to review the basics of licensing and learn why Microsoft uses different licensing models for its many products. If you would like to better understand how Microsoft products are licensed through Microsoft Volume Licensing programs, this guide is a great place to begin. Gore here to download it. You might want to also know – Microsoft Copyright Statement – Who Owns The Screenshots?