This document summarizes the key terms of a software license agreement for Microsoft Windows 8.1. It outlines that the agreement is between the user and either the computer manufacturer/installer or Microsoft, depending on how the software was obtained. The software is licensed, not sold, and can only be used on one device at a time by one user. The agreement includes limitations on copying, transferring, and commercial use of the software. It also describes the mandatory arbitration process for disputes and prohibits class action lawsuits.