A legal agreement between Microsoft Licensing, Inc., and OEMs, regarding the terms of preinstalling, customizing, and distributing Microsoft Windows XP. For system builders, the corresponding agreement is affixed to the side of every OEM Distribution Pack. By opening the package, you agree to all the terms of the Microsoft OEM System Builder Agreement. For royalty OEMs, the license agreement is a signed contract. The specific requirements and customization options that apply to either or both license agreements are documented in the OPK User’s Guide.