The information provided in this guide is intended to help you understand the licensing requirements of software that is used together with one or more Microsoft products. (For example, to use SQL Server software, a server needs to be assigned both a SQL Server license and an operating system license.) You should read and use this guide in conjunction with the terms and conditions under which Microsoft products are licensed. If you acquire licenses under the Microsoft Volume Licensing Program (for example, Enterprise Agreement or Select License), you should refer to the product use rights for the products and the program agreement under which the licenses are acquired. The type and number of licenses required may vary based on how and where you deploy the software. Read more: MS Download